2 1/2" - 4" - COVER SLEEVE O-RING 757 / 957 SKU: 7017896W Alternative SKU: 7017896 $13.00 Login for better price Select Quantity -+ Add to Cart Additional DetailsResourcesManufacturer: Watts Size: 2 1/2 Inch, 3 Inch, 4 Inch Product model: 757 / 757N, 957 / 957N / 957Z 757 / 757N Installation and Maintenance Instructions 757 / 757N Specification Sheet 757 & 757DCDA 2 1/2''-6'' Backflow Preventer Repair