Filter Assembly has a 3 in. PVC slip end and will handle 12 alternating or 24 single shot pulsators.
Filter element is 6-3/4 x 4-5/8
Fresh Air filters extend the life of electric pulsators between servicing by reducing the dust that works like sand paper on the inside of the pulsator body and coil
160215 43550 4999-1081-091 1081-091
Replacement Filter at link below;
17830 Replacement Filter
43553 Replacement Cover