Switching to these stainless models is worth the little extra cost. I've broken several plastic based ones and can be difficult to seal up.
Ordered this to replace an older PRV on a traditional ball lock soda keg. The old PRV had the sealing surface on the bottom where as this one has the oring around the side. This worked like a charm. My old one was leaking and this did the trick to fix it. I'll probably order another to replace the other PRV on the other old keg I have just in case.