💧 Ro-Kit 278, Waterway In-Line and Top Load Filters
Made by Aladdin, manufacturer part number RO-KIT 278.
📏 Specifications
| Specification | Value |
|---|---|
| Brand | Aladdin |
| Manufacturer part number | RO-KIT 278 |
| Part Type | O-ring |
| Cross Section | Kit |
| Inside Diameter | Kit |
| Application Manufacturer | Waterway |
| Application Model | In-Line, Top Load |
| Application Type | Filter |
| Catalog description | Ro-Kit 278, Waterway In-Line and Top Load Filters |
Complete O-ring kits that make servicing easy These o-rings now follow the AS568A O-ring standard used by the O-Ring industry in order to bring a standardized approach to the pool and spa industry. The current part number for an o-ring is 90-423-5xxx, where xxx represents the AS568A designation. This designation ranges from -001 thru -932, in order of smallest to largest first by cross section then by diameter. Please see substitute item number under “Quick info” for the current SKU for this item.
Exploded parts diagram: This part is shown on the Top Load Filter, Waterway exploded parts diagram.
🔧 Top Load Filter, Waterway – exploded parts diagram

The numbered parts below make up this assembly. Parts we stock are linked – click any to view.
| No. | Part |
|---|---|
| – | _513-1000 |
| – | _550-2698 |
| – | Tank Lid, Waterway Top-Load, with Brominator |
| 20 | 16-270-W005K20 |
| – | Ro-Kit 278, Waterway In-Line and Top Load Filters ◀ this part |
| 19 | 16-270-W005K19 |
| 18 | 16-270-W005K18 |
| 17 | 16-270-W005K17 |
| 16 | Tank Base, Waterway Top-Load |
| 15 | Bypass Valve, WW In-Line/Top Load/Mount/Front Access, 1-1/2" |
| 14 | Bypass Valve, WW In-Line/Top Load/Top Mount/Front Access, 2" |
| 13 | 16-270-W005K13 |
| 12 | Mount Nut, Waterway Top-Load/Dyna-Flo/Ultra Skim/Top Mount |
| 11 | 16-270-W005K11 |
| 10 | 16-270-W005K10 |
| 9 | 16-270-W005K9 |
| 8 | Spacer, Waterway In-Line/Top-Load/Dyna-Flo/Flo-Pro/Top Mount |
| 7 | Flow Restrictor, Waterway Top-Load |
| 6 | 16-270-W005K6 |
| 5 | 16-270-W005K5 |
| 4 | Tank Lid, Waterway Top-Load, 6-1/4"od |
| 3 | O-Ring, 5/8" ID, 3/32" Cross Section, Generic |
| 2 | Air Bleed Plug,Waterway In-Line/Top-Load,3/8"mpt,w/o O-Ring |
| 1 | 16-270-W005K1 |
🔧 Exploded diagram and parts
This part belongs to the Top Load Filter, Waterway assembly. Everything listed below is something we stock for it, and the numbers match the diagram.
Complete cartridge filters
Show 4 complete cartridge filters we stock
| No. | Part | Our part number | Availability | Price | ||
|---|---|---|---|---|---|---|
| 18 | ![]() |
Waterway Filter Assembly 502-2510 | 502-2510 | 15 in stock | $174.89 | Add to cart |
| 18 | ![]() |
Waterway Filter Assembly 502-5010 | 502-5010 | 33 in stock | $190.61 | Add to cart |
| 19 | ![]() |
Waterway Filter Assembly 502-7510 | 502-7510 | 12 in stock | $224.61 | Add to cart |
| 19 | ![]() |
Waterway Filter Assembly 502-9910 | 502-9910 | 7 in stock | $242.10 | Add to cart |
Parts that go with this
| Part | Our part number | Availability | Price | ||
|---|---|---|---|---|---|
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Tool, Pool Tool, O-Ring Pick | 134 | 18 in stock | $11.23 | Add to cart |
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O-Ring Chart, Aladdin | MG1 | 17 in stock | $83.58 | Add to cart |










































