ORDER ONE FOR EACH CANISTER YOU HAVE!  1 means one O-ring.

After 6 years, you need to replace the canister O-rings for your countertop kitchen filter.

SOLD INDIVIDUALLY.  THIS ITEM IS FOR ONE O-RING.

GET ONE FOR EACH CANISTER IN YOUR SYSTEM.  SELECT 1 IF YOU HAVE A SINGLE CANISTER, 3 IF YOU HAVE A 3-CANISTER FILTER.