Water heater Check Value Number

[Never_be_Rich]

I have a 1997 Dolphin 536 that has the single by-pass valve and a check valve on the water heater. First, the check valve stuck open and now it wants to stick shut! My drawing does not show the check valve size ... inlet and outlet. Does anyone know sizes and where I can get one ... like lowes, etc? I don't want to take it apart and run around looking for one. We are snowbirding in the MH now.

Thanks!

[Never_be_Rich]

Stopped at a small RV dealer ... parts dept knew what it was by looking at drawing. Gave me one that fit! Usually does not happen that way for me, always requires 2 or 3 trips. Part is labeled SA RV G-784 MBC . Maybe help someone else