My Delta shower has developed a drip, and I believe I need to replace the housing assy (p/n RP19085). Problem is it's not stocked locally and some searches of online plumbing supply sites have come up dry (no pun intended!).
The part looks like two cylinders with o-rings at one end and seats&springs and the other end, fastened together and made of light-colored plastic/nylon.
Anyone have any sources for these?
The diagram is at: