Pentair O-Ring | System 3 Modular Media Filter | 35505-1429Z
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- SKU:
- 35505-1429Z
-
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About This Item
The Pentair 35505-1429Z is the OEM replacement O-ring for the System 3 Modular Media Filter SM Series. This single O-ring maintains a pressure-tight seal within the filter assembly, preventing water bypass and preserving filtration efficiency.
⚠️ 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.
When this seal degrades, water can bypass the intended flow path, reducing filtration efficiency and potentially causing leaks at the filter body connections. Replacing it at the first sign of weeping or visible cracking restores a proper pressure-tight seal. Match the part number on your existing O-ring before ordering to confirm this is the correct size for your configuration.
Specifications
| Pentair Part Number | 35505-1429Z |
| Part Category | O-Ring |
| Quantity Included | 1 (Each) |
Fits Into
| Brand | Equipment Line | Model / Part Number | Notes |
| Pentair (formerly Sta-Rite) | System 3 Modular Media Filter | S7M120 | 1 required per unit |
| Pentair (formerly Sta-Rite) | System 3 Modular Media Filter | S7M400 | 1 required per unit |
| Pentair (formerly Sta-Rite) | System 3 Modular Media Filter | S8M150 | 1 required per unit |
| Pentair (formerly Sta-Rite) | System 3 Modular Media Filter | S8M500 | 1 required per unit |
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
The System 3 filter contains multiple O-rings of different sizes — confirm you are ordering the correct one by matching the part number stamped or printed on the original before adding to cart. When servicing the filter, inspect all accessible O-rings at the same time and replace any that show flattening, cracking, or surface tackiness. Before installing this O-ring, apply a thin coat of Pentair R172351 Lifeguard® Silicone Lubricant to help seat it evenly, prevent tearing during assembly, and extend service life. Never use petroleum-based lubricants — they will degrade rubber O-rings.
