Balboa Standard Air Control [1 3 4" HS x 2 5 8" FD] [Gray] (10 2100GRY) ultrapurewater A repair kit like this A repair kit like this is especially useful when the valve body remains serviceable and the weakness is clearly concentrated in the diverter side of the assembly This OEM diverter kit is a practical service solution for compatible Pentair applications that need renewed internal diverter performance this part helps restore smoother adjustment and gives the visible control point a cleaner and this Balboa Standard Air Control is designed for compatible gray finish applications using a 1 3 4 inch hole size and 2 5 8 inch face diameter where the original control has become stiff