This kit is a set of complete Check Seat Removal Tools compatible with all 1/4” - 2" Zurn Wilkins Model 950XL, 975XL, 950XLT2 and 975XL2 backflow prevention assemblies. This set of three tools provides a seat removal tool for 1/4" - 1/2" (971-SEATTOOL), 3/4" - 1" (972-SEATTOOL), and 1-1/4" - 2" (973-SEATTOOL) 900XL series of backflow assemblies. Backflow Check Seat Removal Tools are sold as accessories to aid in the quick and simple removal of the seat for repairs or replacement to extend the life of the backflow preventer.