The Pentair 35505-7438Z is the OEM replacement O-ring for the Sta-Rite System:3 Modular SMD Series D.E. Filter measuring 2-3/4″ x 1/4″ and designed to maintain a leak-free seal at the elbow connection on this filter system.
IMPORTANT: LUBRICATION REQUIRED SOLD SEPARATELY
Always lubricate this O-ring with a silicone-based lubricant before installation. We carry the Pentair R172351 Lifeguard Silicone Lubricant the OEM-matched product for Pentair equipment.
This O-ring seals the elbow fitting on the Sta-Rite System:3 SMD Series D.E. Filter. When this seal degrades or takes a compression set, water can weep from the elbow joint replacing it with the correct OEM-profile O-ring restores a proper pressure-tight seal. Match the part number on your existing O-ring before ordering to confirm this is the correct profile for your filter configuration.
Specifications
| Pentair Part Number | 35505-7438Z |
| Also Known As | 35505-7438 (Pentair, formerly Sta-Rite) |
| Dimensions | 2-3/4″ x 1/4″ |
| Quantity Included | 1 |
Fits Into
| Brand | Equipment Line | Model / Part Number | Notes |
| Pentair (formerly Sta-Rite) | System 3 Modular D.E. Filters | SMD | Included with Elbow and Bulkhead Assembly (Key No. 12) |
Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment’s manual or on the original part itself before ordering.
Pro Tip
Before installation, apply a thin coat of Pentair R172351 Lifeguard Silicone Lubricant to the O-ring. This helps seat it evenly, prevents tearing during assembly, and extends service life. Never use petroleum-based lubricants they will degrade rubber O-rings and cause premature failure.
