Used this as a replacement for PK2004sp (older version with spring). It was a quarter inch too short, but I was able to lengthen it by re-sweating the end joint with the gasket (remove gasket first so you don't melt it). Melt solder with a torch, lengthen by 1/4", and re-sweat with torch. Fits perfectly now.

Product and service was great, plus fast shipping. Can't ask for anything more.