Harrison from Valley Center writes
size of the little piston is 1.65 dia? That is the size of the piston where the valve fits onto it.
We only recommend using Chapin parts in Chapin sprayers. Chapin does make many Stanely brand sprayers, and the piston collar #6-8134 should fit the Stanley model 61804 sprayer. If you are not sure of your exact sprayer model, then we recommend calling Chapin directly at 800-950-4458.
Answer last updated on: 05/30/2018