Pressure relief valve

[all4him]

In need of help!

I have a Pentair FSN plus DE filter on my pool. The pressure relief valve has broken twice in a year and I am about to put on my third. Does anyone have knowledge of how to replace this valvle with a better quality valve or make one out of PVC? I know you can make one from brass but that will not do very well with a salt generating system (corrosion).

If not I guess I will have to buy stock in the company that makes them!

Any information will be deeply appreciated.

Thanks