SUPER-PRO O-Ring, OEM Name: American Products(R) (Pentair(R))/Baker Hydro (Waterco)/Hayward(R) (Arneson & Comfortzone)/Landon/Pac Fab (Pentair(R))/Swimquip(TM) (Sta-Rite(R)/Pentair(R)), OEM Part: 47721000/39010000/NS/31B0035/NS/192115/35505-1116/14930-32/14930-0032, For Use With: Cyclojet Small, Ultra-Flow(R) Impeller Lock, Crank, P/P Valve Index Plate, MicroClear(TM) Spacer & Vertical Grid DE 7200 Filter, Crank Shaft, Drain Plug Spin Filter Crank, For Challenger(R), SuperFlo(R), Tagelus(R) & WhisperFlo(R) (2 Required), Piston Assembly Stem/Plastic Valve, Duetta Plastic Slide Valve/Small Index Plate