If you have issues with water pressure take out the grren restrictions with orings and the screens with orings then dremel out the white plastic piece to make a complete egg shape. That took me 2 days to figure out. I had already cleared the shower head and shower head pipe/head diverter but didn't think about the mixing valve. After I took those parts out and did 3 minutes with a dremel I got prob 5gpm. It screams water pressure. Hope this helps someone

My shower valve gave out after many years of service. Called Pfister, who sent me a replacement cartridge absolutely free, including free shipping. Awesome customer service.