1/4"-1/2" Relief Valve Seat Kit For a 400B SKU: 7018521 $14.00 Login for better price Select Quantity -+ Add to Cart Additional DetailsResourcesManufacturer: Ames Size: 1/4 Inch, 1/2 Inch Product model: 400B / LF400B Installation and Maintenance Instructions Series 400B ½"- 2" Backflow Preventer Repair