The SHURflo Aqua King II Junior 4128-110-E04 is a 12-volt, 2 GPM freshwater demand pump primarily documented for marine plumbing. Its factory service drawing separates the pump head, valve plate, diaphragm drive and motor so the correct repair piece can be identified from the original number.
Original manufacturer parts illustrations
Find the original callout in the manufacturer's drawing, then use the table below to identify its part number. Open the PDF to view small details at full size.
Parts by diagram number
These are the exact part references shown for this model or assembly in the manufacturer's service chart. Product links are included where NewRVParts carries the matching numbered item.
| Callout | Part no. | Assembly or function | Product |
|---|---|---|---|
| 1 | 94-800-22 | Upper housing and switch assembly | |
| 2 | 94-800-01 | Valve assembly | View item |
| 3 | 94-800-25 | Diaphragm and drive assembly | |
| 4 | 94-71-003-07 | Motor and gasket assembly | |
| 1–3 | 94-800-28 | Complete pump head, without motor | |
| Not shown | 94-800-03 | One-way service check valve | View item |
Related parts and product photographs
The product images below come from current NewRVParts listings. Use the manufacturer number and the complete model information to check each part before buying.
Match the correct model and revision
The 4128 uses upper housing 94-800-22 and drive assembly 94-800-25. The higher-output 4138 uses different parts: 94-800-23 and 94-800-26. Although the valve and check valve share original service numbers, the complete pump heads do not.
For freshwater transfer or a custom RV plumbing installation, verify the 12V supply, 30 PSI shut-off pressure and plumbing requirements rather than assuming it replaces an unrelated RV pump. Use 4128-110-E04 or the OEM 4128-110-A04 model designation on the label.