brew shop in SJ usually stocks them(PRV)....i know a couple yrs ago they had some in stock when i needed a replacement...i was in the area at the time, so was convenient..just a thought if you're gonna be in that area soon. When i get home i'll see if i got any parts lying around....is your's salvageable at all? i had one the small black rubber fell off...swapped it with another 'stem' i guess you could call it....couldn't just use any replacement as the body part that screwed into the lid was different thread and length...but managed to use the center part that's inside the spring part.