This product is a universal wrench to loosen and tighten the following water filter canisters:

CCI-5CLW12 (for CCI-5-Ca 5-inch water filter)
CCI-10CLW (for CCI-10-Ca 10-inch water filter)
CCI-10CLW12 (for CCI-10-Ca 10-inch water filter)

Wrench Dimensions:

Outer diameter of wrench: 5"
Inner diameter of wrench: 4"