Pentair Washer, Flat | EQ Series Commercial Plastic Pump | 356789
Pentair Pool Products and Parts

Pentair Washer, Flat | EQ Series Commercial Plastic Pump | 356789

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SKU:
356789

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About This Item

The Pentair Washer, Flat (356789) is the OEM replacement stainless steel flat washer for the EQ Series Commercial Plastic Pump, measuring 11/16 in. ID x 1-5/16 in. OD x .078 in. thick.

⚠️ IMPORTANT: 8 WASHERS REQUIRED PER UNIT
This listing is for a single washer. The EQ Series pump requires 8 of this washer for a complete service. Order accordingly.

This 300-series stainless steel flat washer seats and secures components within the EQ Series pump assembly. Replacing worn or corroded washers maintains proper clamping force and prevents fastener-related leaks.

Specifications

Pentair Part Number 356789
Material 300 Series Stainless Steel
Dimensions 11/16 in. ID x 1-5/16 in. OD x .078 in. thick
Quantity Included 1 washer (8 required per EQ Series pump — order 8)

Fits Into

Brand Equipment Line Model / Part Number Notes
Pentair EQ Series Commercial Plastic Pump EQ Series 8 required per pump

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

When servicing the EQ Series pump, inspect all 8 washer positions for corrosion or deformation before reassembly. 300-series stainless steel is corrosion-resistant in pool environments, but washers that show pitting or are no longer flat should be replaced as a complete set — mixing worn and new washers results in uneven clamping force.

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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