💧 Waterway Uni-Might Spa Circulation Pump — 1/8 HP 230V 48-Frame 1-1/2″ MBT | 3410020-1X86
Unique in-line suction and discharge design for compact spa installations
♨️ Product Overview
The Waterway Uni-Might is a 1/8 HP, 230V, 48-frame circulation pump with a design feature found on no other pump in the Waterway lineup: both the suction and discharge connections are aligned on the same axis — both exiting from the top of the wet end. This in-line configuration makes the Uni-Might the ideal choice for compact equipment bays where standard center-suction / side-discharge pumps simply won’t fit, and for spa manufacturers who route their plumbing in a straight line through the pump.
Built on the same proven 48-frame motor platform as its cousin the Waterway Iron Might, the Uni-Might delivers 40 GPM at just 0.8A draw on 230V/60Hz, running at 1725 RPM for reliable 24-hour continuous-duty circulation. The volute can be rotated to four positions (12:00, 3:00, 6:00, or 9:00) to align with existing plumbing, and the pump uses high-quality Viton seals for long-lasting chemical resistance in treated spa water.
The Uni-Might serves as a direct replacement for the Aqua-Flo FMVP and CMVP circulation pumps and is the OEM circulation pump in Hawkeye and Barefoot Spas. Connections are standard 1-1/2″ MBT (measuring 2-3/8″ OD). Unions and power cord are sold separately. Backed by Waterway’s commitment to American-designed quality and a 1-year manufacturer warranty.
⭐ Key Features
- ✅ In-Line Suction & Discharge — Both connections aligned on the same axis (top-top) for compact installations
- ✅ 1/8 HP / 230V / 0.8A — Low amperage draw for energy-efficient 24-hour continuous duty
- ✅ 40 GPM Flow Rate — High-flow circulation for effective water turnover and filtration
- ✅ 48-Frame Motor / 1725 RPM — Thru-bolt design with A.O. Smith F48P83A79 motor (5.5″ diameter)
- ✅ 1-1/2″ MBT Connections — Standard spa union thread size (2-3/8″ OD) on both suction and discharge
- ✅ 4-Position Rotatable Volute — 12:00, 3:00, 6:00, or 9:00 — align with your existing plumbing
- ✅ High-Quality Viton Seals — Superior chemical resistance for long life in chlorine/bromine treated water
- ✅ Replaces Aqua-Flo FMVP / CMVP — Direct replacement for discontinued Aqua-Flo circulation pumps
- ✅ OEM in Hawkeye & Barefoot Spas — Factory-installed in these brands
- ✅ 50/60 Hz Compatible — Works on both US (60Hz) and international (50Hz) power
- ✅ American-Designed Quality — Waterway Plastics engineering and manufacturing standards
- ✅ 1-Year Manufacturer Warranty — Full coverage from Waterway
🔩 Technical Specifications
| Specification | Value |
|---|---|
| Manufacturer | Waterway Plastics |
| Model | Uni-Might |
| SKU | 3410020-1X86 |
| Pump Type | Circulation Pump — 24-Hour Continuous Duty |
| Motor Power | 1/8 HP (also listed as 1/15 HP — same pump, different rating methodology) |
| Voltage | 230V |
| Frequency | 50/60 Hz |
| Phase | Single Phase |
| Amperage | 0.8A (at 60 Hz) |
| Speed | Single Speed |
| RPM | 1725 (at 60 Hz) |
| Flow Rate | 40 GPM |
| Frame | 48Y — Thru-Bolt Design |
| Motor | A.O. Smith F48P83A79 — 5.5″ Diameter |
| Suction Connection | 1-1/2″ MBT — Top (2-3/8″ OD) |
| Discharge Connection | 1-1/2″ MBT — Top (2-3/8″ OD) — In-Line with Suction |
| Port Configuration | In-Line — Suction and Discharge Aligned on Same Axis (Both Top) |
| Volute Positions | 12:00, 3:00, 6:00, 9:00 (Rotatable) |
| Seal Type | Viton |
| Wet End Part Number | 310-5070 |
| Dimensions (L × W × H) | 13.2″ × 6.5″ × 8.4″ (335mm × 166mm × 214mm) |
| Cord | NOT Included — Reuse existing or purchase separately |
| Unions | NOT Included — Sold separately (1-1/2″ MBT unions) |
| Self-Priming | No — Must Be Installed Below Water Level |
| Drain Plugs | 2 |
| Certifications | UL Listed |
| Warranty | 1 Year Manufacturer |
⚡ Electrical Requirements
| Electrical Spec | Requirement |
|---|---|
| Supply Voltage | 230V |
| Frequency | 50/60 Hz |
| Phase | Single Phase |
| Amperage | 0.8A (at 60 Hz) |
| Cord | NOT INCLUDED — Reuse existing or purchase separately |
⚠️ IMPORTANT:
All electrical work must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local building codes. Hot tubs require GFCI (Ground Fault Circuit Interrupter) protection. A dedicated circuit is required — do not share with other appliances.
⚠️ AMPERAGE MATCHING TIP: When matching pumps for replacement, always use amperage rather than horsepower. Many times the labeled horsepower does not accurately represent actual horsepower. Match the amperage draw to ensure your control system and wiring are compatible.
🔄 Compatibility Guide
⚠️ CRITICAL — Uni-Might vs Iron Might — Different Port Configurations
The Waterway Uni-Might and Iron Might share the same motor and deliver the same flow rate, but they have completely different wet end configurations and are NOT interchangeable without modifying your plumbing.
| Feature | Uni-Might (This Pump) | Iron Might |
|---|---|---|
| Suction Location | Top | Center (Front Face) |
| Discharge Location | Top — In-Line with Suction | Side |
| Port Alignment | In-Line (Same Axis) | 90° Offset |
| Best For | Compact / in-line plumbing | Standard spa installations |
| Flow Rate | 40 GPM | 40 GPM |
| Voltage / Amperage | 230V / 0.8A | 230V / 0.8A |
| Frame | 48 | 48 |
| Connections | 1-1/2″ MBT | 1-1/2″ MBT |
| Motor | Same (A.O. Smith 48-frame) | Same (A.O. Smith 48-frame) |
💡 Which one do you need? Look at your current pump. If the suction and discharge both exit from the top in a straight line, you need the Uni-Might. If the suction is on the front face and the discharge exits from the side, you need the Iron Might.
Waterway “Might” Circulation Pump Family
| Model | HP | Voltage | Amperage | Connections | Port Config | Flow |
|---|---|---|---|---|---|---|
| Uni-Might 230V (This Pump) | 1/8 | 230V | 0.8A | 1-1/2″ MBT | In-Line (Top/Top) | 40 GPM |
| Uni-Might 115V (3410030-0X / 3410030-1X) | 1/8 | 115V | 1.3A | 1-1/2″ MBT | In-Line (Top/Top) | 40 GPM |
| Iron Might 230V (3J10020-1E) | 1/8 | 230V | 0.8A | 1-1/2″ MBT | Center / Side | 40 GPM |
| Iron Might 115V (3410030-1E) | 1/8 | 115V | 1.3A | 1-1/2″ MBT | Center / Side | 40 GPM |
| Tiny Might 230V (3312620-14) | 1/16 | 230V | 0.4A | 1″ Union | Center / Side | 18 GPM |
| Tiny Might 115V (3312610-14) | 1/16 | 115V | 0.8A | 1″ Union | Center / Side | 18 GPM |
Replaces These Pumps
| Replaced Pump | Notes |
|---|---|
| Aqua-Flo FMVP | Waterway Uni-Might is the direct replacement |
| Aqua-Flo CMVP | Waterway Uni-Might is the direct replacement |
Compatible Spa Brands (Verified)
- ♨️ Hawkeye Spas — OEM circulation pump
- ♨️ Barefoot Spas — OEM circulation pump
🔗 Alternate Part Numbers & Cross-References
Primary Part Numbers
| Part Number | Description |
|---|---|
| 3410020-1X86 | Parts4Tubs SKU / Current Model |
| 3410020-1X | Waterway base model number |
| 3410020-0X | Alternate Waterway model (less unions designation) |
| 3410020-0X86 | Alternate with -86 suffix |
| WW34100201X86 | Pool-Spa-Supplies format |
| WW34100200X | Alternate distributor format |
Additional Cross-Reference Numbers
| Part Number | Description |
|---|---|
| CP-1/8-1N22A | OEM / Spa manufacturer part number |
| 00710003-2510 | Alternate distributor number |
| 1-00-0223 | Alternate distributor number |
| 314670 | Alternate distributor number |
| 34-270-1070 | Alternate distributor number |
| 34-270-1075 | Alternate distributor number |
| 5175-102 | Alternate distributor number |
| 15-350-1002 | Alternate distributor number |
| 341002A-0X | Alternate distributor number |
| 34100200X | Concatenated format |
| 34100201X | Concatenated format |
Related But NOT Interchangeable
| Part Number | Description |
|---|---|
| 3J10020-1E (Iron Might 230V) | Different wet end — center suction / side discharge |
| 3410030-1E (Iron Might 115V) | Different voltage AND different wet end |
| 3410030-1X / 3410030-0X86 (Uni-Might 115V) | Same wet end config but 115V — verify voltage before ordering |
| 3312620-14 (Tiny Might 230V) | Smaller pump, 1″ connections, 18 GPM |
Replacement Parts
| Part Number | Description |
|---|---|
| 310-5070 | Uni-Might Wet End (complete volute assembly) |
| 319-0019 | Anti-Vibration Pump / Motor Base |
| 711-4050 | 1-1/2″ Pump / Heater Tailpiece O-Ring Gasket |
🛠️ Installation Requirements
What’s in the Box
- ✅ Waterway Uni-Might Circulation Pump
- ❌ Power cord NOT included — reuse existing or purchase separately
- ❌ Unions NOT included — purchase 1-1/2″ MBT unions separately
Mounting
| Requirement | Specification |
|---|---|
| Position | Below water level (NOT self-priming) |
| Orientation | Horizontal — motor must remain dry |
| Frame | 48Y — Thru-bolt design |
| Base | Solid, level, vibration-dampening surface |
| Ventilation | Ensure adequate airflow around motor for cooling |
Plumbing
| Connection | Size | Location |
|---|---|---|
| Suction | 1-1/2″ MBT (2-3/8″ OD) | Top |
| Discharge | 1-1/2″ MBT (2-3/8″ OD) | Top — In-Line with Suction |
| Unions | 1-1/2″ MBT — NOT included | Purchase separately |
Volute Rotation
The volute can be rotated to align suction and discharge with your existing plumbing:
- Remove the volute fastening screws
- Rotate the volute to the desired position (12:00, 3:00, 6:00, or 9:00)
- Reinstall and tighten all fastening screws evenly
Installation Notes
⚠️ GFCI protection is required by the National Electrical Code (NEC) for all hot tub and spa installations.
⚠️ Power cord is NOT included. Reuse the cord from your existing pump or purchase a compatible AMP cord, mini J&J cord, or in.link cord separately.
⚠️ Unions are NOT included. Purchase 1-1/2″ MBT unions separately — use o-ring gasket 711-4050 for a watertight seal.
⚠️ Never run the pump dry — ensure the spa is filled and air bled from the plumbing before first startup.
⚠️ Consider installing an anti-vibration pump base (319-0019) to reduce noise and vibration during 24-hour operation.
⚠️ When replacing an Aqua-Flo FMVP or CMVP, verify that the Uni-Might’s in-line port configuration matches your existing plumbing layout.
⚙️ Maintenance Guide
Routine Maintenance
| Task | Frequency | Notes |
|---|---|---|
| Check for leaks at seal | Monthly | Inspect around shaft seal area and union connections |
| Inspect union o-rings | Monthly | Lubricate with silicone and replace if worn |
| Verify water flow | Monthly | Reduced flow indicates clogging or impeller wear |
| Inspect motor vents | Quarterly | Keep clear of debris for adequate cooling |
| Check mounting bolts | Quarterly | Tighten if loose |
| Check amperage draw | Annually | Should read approximately 0.8A at 230V/60Hz |
Warning Signs — Replace Pump If:
- Water leaking from shaft seal area (Viton seal wear)
- Unusual noise (grinding, squealing, rattling)
- Reduced or no water flow
- Motor overheating or tripping breaker
- Motor fails to start
- Visible damage to wet end or motor housing
Seal & Wet End Information
- 📍 Seal Type: Viton — high chemical resistance
- 📍 Wet End Part: 310-5070 (complete volute assembly available)
- 📍 O-Ring: 711-4050 (tailpiece o-ring gasket)
🎯 Ideal Applications
| Application | Suitability | Notes |
|---|---|---|
| ♨️ 24/7 Spa Circulation & Filtration | ✅ Yes | 40 GPM continuous duty at 0.8A |
| ♨️ Compact Equipment Bays | ✅ Yes — BEST Choice | In-line port design saves space |
| ♨️ In-Line Plumbing Layouts | ✅ Yes — BEST Choice | Suction and discharge on same axis |
| ♨️ Hawkeye Spas | ✅ Yes | OEM circulation pump |
| ♨️ Barefoot Spas | ✅ Yes | OEM circulation pump |
| ♨️ Aqua-Flo FMVP / CMVP Replacement | ✅ Yes | Direct replacement — verify port alignment |
| ♨️ Standard Center-Suction / Side-Discharge | ❌ No — Wrong Configuration | Use Iron Might instead |
| 🛁 115V Spa Systems | ❌ No — Wrong Voltage | Use Uni-Might 115V (3410030-1X) instead |
| 🛁 1″ Connection Plumbing | ❌ No — Wrong Size | Use Tiny Might instead |
❓ Frequently Asked Questions
Q: What makes the Uni-Might different from the Iron Might? A: The port configuration. The Uni-Might has both suction and discharge on top, aligned on the same axis (in-line). The Iron Might has center suction on the front face and side discharge. Both use the same 48-frame motor and deliver 40 GPM at 0.8A. Choose based on your plumbing layout — they are NOT interchangeable without replumbing.
Q: Is this 1/8 HP or 1/15 HP? A: Both ratings refer to this same pump. The difference is the rating methodology — 1/8 HP reflects brake horsepower while 1/15 HP reflects continuous duty horsepower. The pump draws 0.8A at 230V and delivers 40 GPM regardless of which HP rating is listed.
Q: Does this come with unions? A: No. Unions are sold separately. You need 1-1/2″ MBT unions (2-3/8″ OD). The tailpiece o-ring gasket is part number 711-4050.
Q: Does this come with a power cord? A: No. Reuse the cord from your existing pump or purchase a compatible cord separately (AMP, mini J&J, or in.link connectors available).
Q: Can the volute be rotated? A: Yes. The volute rotates to four positions (12:00, 3:00, 6:00, or 9:00) by removing and reinstalling the fastening screws.
Q: Will this replace an Aqua-Flo FMVP? A: Yes. The Waterway Uni-Might is the direct replacement for the Aqua-Flo FMVP and CMVP circulation pumps. Verify that the in-line (top/top) port configuration matches your existing plumbing.
Q: What voltage does this require? A: 230V / 50/60Hz. This pump works on both 50Hz and 60Hz power (at 60Hz: 1725 RPM / 0.8A; at 50Hz: 1450 RPM / higher amperage). Verify your spa’s electrical supply before ordering. A 115V version is also available (3410030-1X).
Q: What are the dimensions? A: Approximately 13.2″ long × 6.5″ wide × 8.4″ tall (335mm × 166mm × 214mm).
Q: How do I know if I need a Uni-Might or Iron Might? A: Look at your current pump. If both pipes go straight up from the top of the pump in a line, you need the Uni-Might. If one pipe comes out the front and one from the side, you need the Iron Might.
Q: Do I need a GFCI breaker? A: Yes. GFCI protection is required by the National Electrical Code (NEC) for all hot tub and spa installations.
Q: What warranty is included? A: 1-year manufacturer warranty from Waterway Plastics. Contact Parts4Tubs for full terms.
🏆 Why Choose the Waterway Uni-Might
- ✅ Unique In-Line Port Configuration — Both connections on same axis for compact installations
- ✅ 40 GPM at Only 0.8A — High flow with low energy consumption for 24/7 duty
- ✅ Proven 48-Frame Motor — Same reliable A.O. Smith motor platform as the Iron Might
- ✅ Viton Seals — Premium chemical resistance for long life in treated spa water
- ✅ 4-Position Rotatable Volute — Flexible installation to match any plumbing layout
- ✅ Replaces Aqua-Flo FMVP / CMVP — Direct replacement for discontinued pumps
- ✅ 50/60 Hz Dual Frequency — Works on US and international power supplies
- ✅ OEM in Hawkeye & Barefoot Spas — Factory-trusted reliability
- ✅ Replaceable Wet End — 310-5070 available for rebuild instead of full replacement
- ✅ American-Designed Quality — Waterway Plastics engineering standards
- ✅ 1-Year Manufacturer Warranty — Full Waterway coverage
🤝 Why Buy from Parts4Tubs
- ✅ Fast shipping across the United States
- ✅ Expert advice from spa and hot tub specialists
- ✅ Competitive pricing
- ✅ Full warranty support
- ✅ Hassle-free returns
- ✅ Complete Waterway circulation pump range in stock (Uni-Might, Iron Might, Tiny Might)
- ✅ Compatible unions, cords, and accessories available
- ✅ Dedicated customer service team
✨ Summary
The Waterway Uni-Might 3410020-1X86 is a 1/8 HP, 230V, 48-frame circulation pump with a unique in-line port design where both suction and discharge exit from the top on the same axis — making it the ideal choice for compact equipment bays and in-line plumbing layouts. Delivering 40 GPM at just 0.8A with high-quality Viton seals and a 4-position rotatable volute, this pump directly replaces the Aqua-Flo FMVP/CMVP and is OEM in Hawkeye and Barefoot Spas. Unions and cord sold separately. 50/60Hz compatible. Order today from Parts4Tubs with 1-year Waterway manufacturer warranty.










