CFS O-Ring Compatible with Pentair R172221, 5 Pack

CFS replacement O-ring, Buna-N (nitrile) 70 durometer. Size AS568-012: 0.364 in ID x 0.070 in cross-section (9.25 mm x 1.78 mm), about 0.504 in (12.81 mm) outside diameter. Sold in packs of 5 rings.

Fit and part numbers

• Compatible with Pentair R172221 (also listed as P6031): Pentair and Bestway vent valve / drain seal.

Measure your old ring first

Seal sizes vary by brand and by model year. Lay your old ring flat and measure the inside diameter and the thickness: it should be close to 0.364 in x 0.070 in. Old rings stretch or swell a little, so expect a small difference.

Wipe the groove clean and apply a thin film of silicone O-ring lubricant before fitting. Never use petroleum grease on a Buna-N ring.

Buna-N is the standard material for pump lids, unions, valves and filter tanks. Chlorinator and chemical feeder lids need a Viton (FKM) ring instead.

Shipping

Ships in 3-5 business days.

CFS is an independent brand. These are compatible replacement O-rings, not OEM parts. Part numbers and brand names are used only to show fit.