An RV hand pump, water-pump converter and water-heater bypass all help with seasonal winterizing, but they belong at different places in the plumbing. A manual antifreeze pump introduces liquid through a compatible exterior connection. An onboard-pump converter changes what the installed water pump draws from. A water-heater bypass redirects water around a compatible heater tank. Use this guide to identify which assembly you need before choosing a replacement.
Where each winterizing component connects
Outside-inlet hand pump
Onboard-pump converter
Heater bypass
Compare winterizing part numbers by purpose
| MPN | Component role | Important distinction |
|---|---|---|
| Camco 36003 | Outside manual pump | Hand-operated unit with hose; no installed pump-converter valve |
| Valterra P23507VP | Outside manual pump | Hand-operated pump and hose for a matching city-water connection |
| Valterra P23506LFVP | Onboard pump converter | Diverter valve and siphon hardware used at the installed water pump |
| B&B 94230 | Water-source winterizing diverter | Valve-only part for matching suction-side plumbing |
| Camco 35953 / 35963 | Tank water-heater bypass valve | Choose by original Camco design and thread dimensions |
| Valterra P23503LFVP | Water-heater bypass kit | Two-valve system for specified compatible 6-gallon tank heater |
| Valterra P23505LFVP | Water-heater bypass kit | EZ-Turn design for specified compatible 10-gallon tank heater |
Model numbers within one manufacturer are not interchangeable merely because the valves look alike or the heater capacity is similar. Compare the installed fittings, heater type and valve orientation.
Manual hand pumps: connect at the outside inlet
Camco 36003 and Valterra P23507VP are separate manual pump products designed to move RV-approved winterizing fluid through a compatible water connection. Neither replaces a water-heater bypass nor installs at the suction port of the existing freshwater pump. Check the supplied hose and inlet fitting before ordering.
Onboard water-pump converters and source valves
Valterra P23506LFVP is a pump converter kit with a diverter, fluid pickup hose and connection components. B&B Molders 94230 is a separate water-source diverter valve for compatible winterizing suction plumbing. These may perform related functions, but that does not confirm that the B&B valve replaces the complete Valterra converter kit or fits every pump.
Tank-style water-heater bypass fittings
A heater bypass redirects suitable freshwater flow around a tank-style RV water heater. Camco 35953 and 35963 are separate three-way valve products; compare their exact inlet and outlet fittings and original mounting arrangement. Valterra P23503LFVP is a two-valve bypass kit for a specified 6-gallon installation, while P23505LFVP is a 10-gallon EZ-Turn design. These are different products, not universal substitutes for one another.
Identify drain plugs and anodes before protecting the water-heater tank