Leaderboard

OK so valve in the first photo? $250 is not out of line... and easy.. lol. There can be a bit of difficulty for a newb (sorry) in getting everything to not only line back up but sit flush to the heater manifold. Any time you cut plumbing you end up 1.5"-2" shorter and the missing 2" has to be replaced. A 2" coupler and a piece of 2" line would be needed and as mentioned experience helps to get everything to line back up properly and once glue is applied you only get on shot and the glue I use sets FAST 1-3 seconds and your done. Yes you could apply a dab of 2 part plastic weld epoxy to lock the gate in the up position and be good. Wouldn't take much just enough to bond/join the knife/gate to the pump union coupler on the inside and keep it in the up position. If it ever fails and leaks then spend the $250.

Bummer. If you want to DIY it post a few photos of what's on the other side of the valve all the way back to rigid plumbing. Parts and everything needed would be well under a hundred. Difficulty 4/10