Check the listing for details. 86006900 / 2-331-RPM O-Rings for Pentair Pool Filter Bulkhead (3 Pack). Condition: New. Listed at 9.99 USD. Captain O-Ring – Replacement 86006900 / 2-331-RPM O-Rings for Pentair Upper and Lower Bulkhead, Clean & Clear, FNS, Nautilus, etc (3 Pack) Product Features: Part Number: 86006900 (3 pack) [also called 2-331-RPM] Compatible with Pentair Pentair Clean & Clear Plus Pool and Spa Filters, FNS Fiberglass and FNS Plus Vertical Grid Pool/Spa D.E. Filters, Pentair Quad and Nautilus Plus Stainless Steel Pool and Spa D.E. Filters. Check your unit’s owners manual / parts diagram to confirm you are looking for part number 86006900 or 2-331-RPM before ordering to ensure you order the correct o-ring size. Approximate O-Ring Dimensions: 2.20” Inside Diameter (about 2-1/4”), 2.65” Outside Diameter (slightly over 2-5/8”), 0.210” Thickness (slightly over 3/16”). Package contains three (3) o-rings. Replace your leaking o-ring and keep spares on hand for the future with this handy 3-pack. Molded from OEM spec synthetic rubber for long lasting durability and performance, just like when your system was brand new! Manufactured and warrantied by Captain O-Ring LLC. Proudly assembled in the USA! Get your filter back in working order with Captain O-Ring’s replacement 86006900 / 2-331-RPM O-Rings. Compatible with Pentair Pentair Clean & Clear Plus Pool and Spa Filters, FNS Fiberglass and FNS Plus Vertical Grid Pool/Spa D.E. Filters, Pentair Quad and Nautilus Plus Stainless Steel Pool and Spa D.E. Filters. Check your unit’s owners manual / parts diagram to confirm you are looking for part number 86006900 or 2-331-RPM before ordering to ensure you are ordering the correct o-ring size. Molded to OEM specs for size, tolerance, and material for long lasting and stress-free performance and durability. Exact match to the o-ring that came in your system when it was brand new! This handy 3-pack of o-rings (also called gaskets or seals) allows you to replace your leaking o-ring as well as keep spares on hand for any future needs. Approximate O-Ring Dimensions: 2.20” Inside Diameter (about 2-1/4”), 2.65” Outside Diameter (slightly over 2-5/8”), 0.210” Thickness (slightly over 3/16”). Manufactured and warrantied by Captain O-Ring LLC. Proudly assembled in the USA!