Applicable Model: 28633EG, 28635EG, 28645EG, 28647EG, 28651EG, 28671EG, 28677EG, 28681EG. Replacement Part Number: 10747, 25010, 25080RP. Function: It controls the inlet and outlet switch of the water hose from the pool to the filtration system. It can separate the hose to turn off the suction of the pump, or it can be used for vacuum pumping. Note: Suitable for 1500, 2500 and 4000 GPH filtration pumps, as well as brine chlorinator and 2000 GPH chlorinator pump combinations. Package included:4*Plunger valve,3*O-Rings. An 1.5 inch hose part is required to function properly. This product does not contain instructions. Applicable Model: 28633EG, 28635EG, 28645EG, 28647EG, 28651EG, 28671EG, 28677EG, 28681EG. Replacement Part Number: 10747, 25010, 25080RP. Function: It controls the inlet and outlet switch of the water hose from the pool to the filtration system. It can separate the hose to turn off the suction of the pump, or it can be used for vacuum pumping. Note: Suitable for Intex 1500, 2500 and 4000 GPH filtration pumps, as well as Intex brine chlorinator and Intex 2000 GPH chlorinator pump combinations. Package included: 4*Plunger valve,3*O-Rings. An 1.5 inch hose part is required to function properly. This product does not contain instructions.