Pentair O-Ring | System 3 D.E., Sand & Modular Media Filters | 35505-1423Z

Pentair O-Ring | System 3 D.E., Sand & Modular Media Filters | 35505-1423Z

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SKU:
35505-1423Z
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About This Item

The Pentair 35505-1423Z is the OEM replacement air relief nipple O-ring for the Sta-Rite System 3 D.E., Sand, and Modular Media filter series. This single O-ring seals the air relief nipple assembly on the filter tank, preventing air and water from bypassing the fitting during normal filtration operation.

⚠️ 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.

A failed or deteriorated air relief nipple O-ring allows air to escape around the fitting rather than through the relief valve, and can permit water weeping at the nipple base under system pressure. Replacing this O-ring restores a proper seal at the air relief assembly and is a routine service step whenever the filter head is opened for cleaning or grid inspection.

Specifications

Pentair Part Number 35505-1423Z
Quantity Included 1 (Each)

Fits Into

Brand Equipment Line Model / Part Number Notes
Pentair (formerly Sta-Rite) System 3 D.E. Filter — SD Series S7D75
Pentair (formerly Sta-Rite) System 3 D.E. Filter — SD Series S8D110
Pentair (formerly Sta-Rite) System 3 Modular D.E. Filters — SMD Series SMD System 3 Modular D.E. Filters
Pentair (formerly Sta-Rite) System 3 Modular Media Filter — System 3 S7M120
Pentair (formerly Sta-Rite) System 3 Modular Media Filter — System 3 S7M400
Pentair (formerly Sta-Rite) System 3 Modular Media Filter — System 3 S8M150
Pentair (formerly Sta-Rite) System 3 Modular Media Filter — System 3 S8M500
Pentair (formerly Sta-Rite) System 3 Sand Filter — System 3 S7S50 Verify fitment before ordering
Pentair (formerly Sta-Rite) System 3 Sand Filter — System 3 S8S70 Verify fitment before ordering

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 to help it seat evenly, prevent tearing during assembly, and extend service life. Never use petroleum-based lubricants — they will degrade the rubber and cause premature failure.

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Pentair Pool Products and Parts

About Pentair Pool Products and Parts

Pentair is often considered the "gold standard" for pool professionals, and for good reason. Founded in 1966 (originally by five inventors making high-altitude balloons!), the company has evolved into the global leader in smart, sustainable water solutions. For the DIY homeowner, Pentair represents the intersection of rugged durability and silicon valley-tier technology. They pioneered the Variable Speed Pump revolution with the IntelliFlo®, saving American pool owners millions in energy costs. Today, their ecosystem focuses heavily on automation, allowing you to control your pump, heater, lights, and chemistry from a single app. While they are a favorite among professional builders, their "EC" (E-Commerce) line of equipment allows homeowners to access pro-grade technology with valid warranties for DIY installation.

Why We Trust Pentair Pool Products and Parts
Energy Efficiency Leaders: Recipient of the ENERGY STAR® Partner of the Year award for over a decade; their pumps are designed to pay for themselves in energy savings.

Smart Automation: The Pentair Home App and IntelliCenter systems offer best-in-class control over your pool ecosystem from anywhere in the world.

Professional Pedigree: The brand most often recommended and installed by pool builders for high-end residential pools.

Eco-Conscious: Dedicated to reducing water waste and energy consumption through "Green" technology innovations.

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