Pentair Multiport Valve Drain Plug and O-Ring U178-920PZ
Pentair Multiport Valve Drain Plug and O-Ring U178-920PZ
Shasta Pool Supply offers trusted Pentair components designed for performance and precision. Specifically, this Pentair Drain Plug and O-Ring combo provides a reliable seal for Pentair filter systems.
Pentair U178-920PZ Multiport Valve Drain Plug with O-Ring
This OEM replacement part maintains durability and fit consistency across compatible Pentair filter models. Additionally, its precision-molded threading creates a secure, durable connection.

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Key Features
- Designed for exact Pentair filter compatibility and performance assurance
- Maintains leak-free performance under high filtration system pressure conditions
- Molded from durable material engineered for chemical and heat resistance
- Simplifies seasonal pool maintenance through quick removal and replacement
Technical Specifications
- O-ring diameter: 1.75”
- Thread length: 0.75”
- Length: 1.5 in
- Width: 1.5 in
- Height: 1.25 in
- Weight: 0.05 lb
Specs
- Part Number: U178-920PZ
- Manufacturer: Pentair
Which systems is this plug compatible with?
The Pentair U178-920PZ drain plug with O-ring fits most Pentair multiport valves used on Tagelus, Sand Dollar, and Cristal-Flo II sand filters. It works with both 1.5" and 2" top or side-mount valve models.
Pro Tip: Apply a light layer of lubrication to the O-ring to ensure a leak-free seal!
How do Pentair OEM pool products compare to Non-OEM Pentair pool products?
Pentair OEM pool products meet exact Pentair specifications. As a result, they provide reliable fit and consistent performance. Additionally, materials and quality control meet strict Pentair standards. They offer dependable operation and lasting system integrity.
Non-OEM products cost less. However, material quality and manufacturing precision vary. Compatibility with Pentair systems is not guaranteed. Lifespan and performance may be reduced. Overall, OEM components deliver quality, while non-OEM products, deliver uncertainty.
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What our customers are saying
Very friendly and knowledgeable staff! Answered all of my questions and provided some information I wasn't aware of which was very helpful.
Very friendly and knowledgeable staff! Answered all of my questions and provided some information I wasn't aware of which was very helpful.
Wade L
I picked up my order at the headquarters in Phoenix. Courteous staff.
I picked up my order at the headquarters in Phoenix. Courteous staff.
William J
Our pool water is very clear. I wasn't really expecting this from the Shasta Pure unit... I feel like our pool is more clear looking, its kinds like swimming in drinking water...
Our pool water is very clear. I wasn't really expecting this from the Shasta Pure unit... I feel like our pool is more clear looking, its kinds like swimming in drinking water...
Erin A.
FAQ
Our expert staff answers customer's most asked questions.
Does this part come include an O-ring?
This part does come with an O-ring included.
Should I lubricate the O-ring?
You should apply a light layer of pool lubrication to the O-ring before installation.
Is this an OEM part?
Yes this part is original, from the manufacturer, and contains a manufacturer part number.
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