💧 Tool, Clamp Knob Socket, 4-Lobe, w/1/4″ Socket Bit Adapter
Made by Multi-Tork, manufacturer part number MT-501. It is listed for the equipment shown below, so check the model on your own unit against that list.
📏 Specifications
| Specification | Value |
|---|---|
| Brand | Multi-Tork |
| Manufacturer part number | MT-501 |
| Tool Type | 4 Lobe, Socket |
| Tool Application | Multiple |
| Tool Type Group | Install/Removal |
| Catalog description | Tool, Clamp Knob Socket, 4-Lobe, w/1/4″ Socket Bit Adapter |
✅ Listed for
- Pentair Purex CFM Cartridge Filter
- Pentair Purex CFW-120/180/315/405/560 Cartridge Filter
- Pentair/PacFab Nautilus Plus NS24 36 48 60 72 DE Filter
- Pentair/Purex SM/SMBW 2000 2024-2072 1018-105 DE Filter
- Pentair/Purex SM/SMBW 4000 4024-4060 DE Filter
- StaRite Cristal-Flo High Rate T150BP1-T240BP1 Sand Filter
- StaRite Cristal-Flo High Rate T-240BP-2 300BP-2 Sand Filter
- StaRite Max-E-Glas II / Dura-Glas II Pumps
- StaRite Max-E-Glas/Dura-Glas Pumps
- Pentair IntelliPro VS (Before 2019)
- Pentair Sta-Rite Max-E-Pro Series
- Pentair PacFab Challenger High Flow In-Ground Pump
- Pentair PacFab Challenger High Pressure Pump
- Pentair PacFab Hydro Pump
- Pentair WhisperFlo® High Performance Pool Pump
- Pentair Purex Quietflo/Aquatron Pumps
- 120 150 180&AF75 120 180 Pentair PacFab WaterFall Pump AFP75
- Val-Pak/AquaFlo Dominator Medium & High Head Pump
- A&A Manufacturing 5 Port 1-1/2″ Top Feed In-Floor Valve
- A&A Manufacturing 6 Port 1-1/2″ Top Feed In-Floor Valve
MT501 is a lightweight, poly-carbonate clamp knob socket designed for use on virtually any four-lobe industrial filter knob and Pentair's commercial in-line strainer lid model PS-2. Attach with any 3/8” drive ratchet or your portable drill and see the knob removed with ease.
Exploded parts diagrams: This part is shown as the Cartridge Filter, StaRite Posi-Flo, TX & TXR; the Cartridge Filter, StaRite Posi-Flo II, PTM135; the Cartridge Filter,Pentair/StaRite Posi-Flo II,PTM50/70/100; the DE Separation Tank, StaRite; the DE Filter, Jacuzzi, Earthworks EW75, EW100, EW125, EW150; the DE Filter, Jacuzzi, Earthworks EW36, EW48, EW60, EW72; and 22 other assemblies exploded parts diagrams.
🔧 Cartridge Filter, StaRite Posi-Flo, TX & TXR – exploded parts diagram

The numbered parts below make up this assembly. Parts we stock are linked – click any to view.
| No. | Part |
|---|---|
| – | Tool, Socket, Quad-Side A/Solar Side B |
| – | Tool, Clamp Knob Socket, 4-Lobe, w/1/4" Socket Bit Adapter ◀ this part |
| 18e | 16-102-W001K18E |
| 18d | 16-102-W001K18D |
| 18c | 16-102-W001K18C |
| 18b | 16-102-W001K18B |
| 18a | 16-102-W001K18A |
| 17 | Clamp Ring Nut, Pentair Sta-Rite, Brass |
| 16 | 16-102-W001K16 |
| 15 | Clamp Ring, Pentair Sta-Rite PosiFlo TX |
| 14 | O-Ring, Sta-Rite Posi-Flo, Upper Tank Body, O-443 |
| 13 | 17-102-1001 |
| 12 | 16-102-W001K12 |
| 11 | 16-102-W001K11 |
| 10 | Clamp Ring, Pentair Sta-Rite PosiFlo TX, with out Nut |
| 9 | Clamp Ring Nut, Pentair Sta-Rite, Plastic |
| 8 | O-Ring, 9-1/2" ID, 1/4" Cross Section, Generic |
| 7 | 16-102-W001K7 |
| 6 | 16-102-W001K6 |
| 5 | Air Bleed Filter, Pentair Sta-Rite DES/DEP/DEPB/HRP/HRS |
| 4 | Strap, Pentair Sta-Rite PosiFlo TX |
| 3 | 16-102-W001K3 |
| 2 | Pressure Gauge Screen, Pentair Sta-Rite |
| 1 | 16-102-W001K1 |
🔧 Exploded diagram and parts
This part belongs to the Cartridge Filter, StaRite Posi-Flo, TX & TXR assembly. Everything listed below is something we stock for it, and the numbers match the diagram.
| No. | Part | Our part number | Availability | Price | ||
|---|---|---|---|---|---|---|
| 5 | ![]() |
Air Bleed Filter, Pentair Sta-Rite DES/DEP/DEPB/HRP/HRS | WC8-126Z | 61 in stock | $24.35 | Add to cart |
| 9 | ![]() |
Clamp Ring Nut, Pentair Sta-Rite, Plastic | WC36-22 | Available to order | $11.25 | |
| 10 | ![]() |
Clamp Ring, Pentair Sta-Rite PosiFlo TX, with out Nut | WC19-43 | 3 in stock | $83.63 | Add to cart |
Parts that go with this
| Part | Our part number | Availability | Price | ||
|---|---|---|---|---|---|
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Tool, Socket, Double-Hex, 9/16 and 7/8, with 1.48well | MT-100 | 11 in stock | $68.45 | Add to cart |
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Tool, Socket, Dual Geometry for Sta-Rite System 3 | MTJ-770 | 69 in stock | $52.86 | Add to cart |
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Tool, Klorkinator, Lid/Cover Removal Tool | KW-212 | 7 in stock | $106.95 | Add to cart |
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Tool, Button-Hook, Drain Plug Wrench, Stainless Steel | DPW-150 | 23 in stock | $78.24 | Add to cart |
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Tool, Hex-Knob Socket, HCP100,w/1/4" Skt Bit Adpater | MT-881 | 1 in stock | $17.56 | Add to cart |
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Tool, Multi-Tork, Socket, Quad-Side A, New Version | MT-50 | 5 in stock | $61.04 | Add to cart |
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Tool, Socket for Governor Plug, Raypak/Sta-Rite | HPS-200 | 14 in stock | $60.59 | Add to cart |
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Tool, Socket Set, Multi-Tork, 3 Items, Polycarbonate | MT-301 | 20 in stock | $101.25 | Add to cart |





























