Pentair Kit Seal Diamond 2.403 Rplcmnt | 178746Z

Pentair Union Diamond Seal | Clean & Clear RP, Posi-Clear RP & Separation Tank | 178746Z

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SKU:
178746Z
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About This Item

The Pentair Union Diamond Seal (178746Z) is the OEM replacement seal for the union connections on Pentair Clean & Clear RP, Posi-Clear RP, System:2 Modular Media Filter, and Separation Tank filtration systems.

This seal maintains a watertight connection at the union joint on the filter body. A worn or damaged diamond seal allows water to weep or leak from the union, compromising system pressure and wasting water. Replacing this seal with the correct OEM part restores a secure, leak-free union connection.

Specifications

Pentair Part Number 178746Z
Part Name Union Diamond Seal
Part Category Seals
Quantity Included 1 (Each)

Fits Into

Brand Equipment Line Model / Part Number Notes
Pentair Clean & Clear RP CLEAN & CLEAR RP
Pentair Posi-Clear RP PXC100 Fits all Posi-Clear RP filter models
Pentair Posi-Clear RP PXC150 Fits all Posi-Clear RP filter models
Pentair Posi-Clear RP PXC200 Fits all Posi-Clear RP filter models
Pentair System:2 Modular Media Filter PLM100
Pentair System:2 Modular Media Filter PLM150
Pentair Separation Tank SEP 48 Fits Separation Tank SEP 48/72/96/144
Pentair Separation Tank SEP 72 Fits Separation Tank SEP 48/72/96/144
Pentair Separation Tank SEP 96 Fits Separation Tank SEP 48/72/96/144
Pentair Separation Tank SEP 144 Fits Separation Tank SEP 48/72/96/144

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.

Poolaroo Pro Tip

The diamond seal profile on this part is designed specifically for Pentair's union joint geometry — do not substitute a generic flat gasket. When replacing this seal, clean the union face and seat thoroughly before seating the new part. Inspect the union threads and collar for cracking or distortion at the same time; a damaged union body will prevent the new seal from holding pressure regardless of seal condition.

CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
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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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