Pentair 35505-1428 O-Ring Replacement Sta-Rite System 3 SM-Series Modular Media Cartridge Pool and Spa Filter

Pentair System 3 replacement o-ring

This listing identifies the item as a Pentair 35505-1428 O-Ring Replacement for Sta-Rite System 3 SM-Series modular media cartridge pool and spa filters. The Amazon product data lists it as an O-ring replacement.

What to check before buying

• Confirm the failed part on your System 3 SM-Series filter is the o-ring rather than another seal or hardware component.
• Match the seller-stated identifiers: 35505-1428, also shown as PEN355051428Z.
• The listing states measurements of 2-1/4-inch length by 1/4-inch height by 2-1/4-inch width; treat those as listed item dimensions, not proof it fits every System 3 variant.

If your filter needs the media cartridge, tank, lid, or a multi-part repair kit, select a listing for that specific component instead. See the Amazon product data for seller-stated details.