I think any valve with the same specs will suffice. Atwood does not require or use an anode rod if plumbed properly. I just replaced my cousins Atwood heater last week. Someone used steel pipe nipples to connect the water lines. This of course sets up a galvanic action between the Zinc coated steel pipe and the much softer Aluminum tank. This big dummy went and used the steel nipples again, now I must return and replace them with CPVC nipples.
2000 Winnebago Ultimate Freedom USQ40JD,
ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy