Check the listing for details. Captain O-Ring Pentek, Pentair 357255 Lid O-Ring Pool/Spa Pump (3 Pack). Condition: New. Listed at 13.49 USD. Captain O-Ring LLC - Replacement for Pentek, Pentair 357255 Lid O-Ring - Pool and Spa Pump ORing (3 Pack) Product Features: Part: Pentair 357255 Lid O-Ring Replacement (kit contains 3 o-rings) Fits Pentair 348021, 348022, 348023, 348024, 348025, 348026, 340036, 340037, 340038, 340039, 340040, 3400341, 341111, 340042, 340043, and 340044 pool/spa pumps The 357255 o-ring has an inside diameter of just under 5-1/2" and outside diameter of almost 6”. This o-ring's thickness is slightly less than 1/4”. Material: Buna-N (nitrile butadiene rubber) Manufactured and Warrantied by Captain O-Ring LLC, with decades of experience in the sealing and chemical industry. The Pentair 357255 Lid O-Ring (3 pack) fits Pentair 348021, 348022, 348023, 348024, 348025, 348026, 340036, 340037, 340038, 340039, 340040, 3400341, 341111, 340042, 340043, and 340044 pool/spa pumps. See parts diagram in product photos for how this o-ring fits into your pump. The 357255 o-ring has an inside diameter of just under 5-1/2" and outside diameter of almost 6”. This o-ring's thickness is slightly less than 1/4”. --- Only purchase this item if your system calls for Part Number 357255. Please contact Captain O-Ring LLC if you are unsure if this is compatible with your unit. What to expect: This item includes three (3) o-rings in a resealable zip-top poly bag with "Captain O-Ring" branded packaging. Manufactured and warrantied against defect for one year by Captain O-Ring LLC. "Captain O-Ring" is a registered trademark of Captain O-Ring LLC.