The Unicel C-4304 R is the correct compatible replacement for the following:
The Unicel C-4304 Pool & Spa Filter is a closed top replacement water filter cartridge designed to efficiently filter swimming pool and spa water. This compatible replacement filter is made in the U.S.A. and features polyester media with highly effective pleat folds that captures particles in the water. The pleat count of this pool filter cartridge is 51.
Unicel C-4304 Replacement Pool Filter Specifications:
The top end cap is closed and the bottom end cap is open. The inner diameter is 1 15/16" and features wide constructed, break-resistant support bands.