Maintain a leak-free and efficient pool or spa system with the U9-373Z Black O-Ring Replacement. Shasta Pool Supply markets the lowest prices on Pentair parts. Specifically, this high-quality OEM part provides a tight, durable seal for Pentair pumps.
- Genuine Pentair Replacement Part – Ensures precise compatibility and performance with Pentair pumps and filters.
- Leak-Preventing Seal – Keeps your pool system watertight for optimal efficiency.
- Maintains Equipment Efficiency – Protects your pump, filter, and other components from leaks and damage.

Pool Supply Store
Limited Time Sale
Find the best pool equipment to complete your entire pool system. The lowest possible prices offered at fastest shipping.
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Open Box Pentair Plus40 Salt Chlorine Generator Cell 523735-EC
Regular price $1,509.00 USDRegular priceUnit price / perSale price $1,509.00 USDSold out -
Pentair IntelliCenter Personality Upgrade Kit i8P | Single Body 521910
Regular price $599.00 USDRegular priceUnit price / per$1,995.00 USDSale price $599.00 USDSale -
What our customers are saying
I always go to TS Pool Supply for all my pool needs. Professional help with the exact parts I need & quick shipping saves me from driving. The entire team work together and make the experience professional and quickly find what you're looking for.
I always go to TS Pool Supply for all my pool needs. Professional help with the exact parts I need & quick shipping saves me from driving. The entire team work together and make the experience professional and quickly find what you're looking for.
Jeffrey B.
I bought a demo/open box chlorinator from them. So far the product has been working well (one week) and it looked new in the manufacturers box when I got it. Communication with them was great. Price I got for the open box item was worth it. Would use them again. Thanks.
I bought a demo/open box chlorinator from them. So far the product has been working well (one week) and it looked new in the manufacturers box when I got it. Communication with them was great. Price I got for the open box item was worth it. Would use them again. Thanks.
Ken J.
The overall experience was great. The only problem I had was when I tried to find the option of where I would like to pick up my order, it would not allow me to do so at the Surprise location. Dan, from the Surprise location kept in contact with me that same day I put the order in and was able to take my order to the Surprise location as he had been to the warehouse and said he could take it with him, In the end, it all worked out. Thank you Dan for helping me out, very much appreciated!
The overall experience was great. The only problem I had was when I tried to find the option of where I would like to pick up my order, it would not allow me to do so at the Surprise location. Dan, from the Surprise location kept in contact with me that same day I put the order in and was able to take my order to the Surprise location as he had been to the warehouse and said he could take it with him, In the end, it all worked out. Thank you Dan for helping me out, very much appreciated!
Perry M
FAQ
Our expert staff answers customer's most asked questions.
Is it OK to replace a 1 HP pool pump with a 1.5 HP?
Yes, you can replace a 1 HP pump with a 1.5 HP pump, provided the exterior dimensions are the same. However, be cautious about the impeller; while it will fit, it won't pump more water since both motors turn at the same RPM.
How many HP pumps do I need for a pool?
The horsepower (HP) of your pool pump should match your pool size and flow rate, which usually ranges from 40 GPM to 80 GPM. Generally, pool pumps range from 0.75 HP to 3 HP. Opting for a higher GPM flow rate can help reduce wear and tear on your pool equipment.
How often should I replace my pool pump?
On average, a well-maintained pool pump can last 8 to 15 years. However, it’s essential to monitor its performance. If you notice reduced efficiency, increased noise, or frequent repairs, it may be time to consider a replacement.
Learning Center
Blog posts
The latest news and guides making buying and maintaining pool equipment easier.
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What are Our Expert Picks for the Best Variable...
Variable speed pool pumps change the economics of owning a pool. They can reduce energy use by up to 90% and still keep your pool properly circulated. In warm weather...
What are Our Expert Picks for the Best Variable...
Variable speed pool pumps change the economics of owning a pool. They can reduce energy use by up to 90% and still keep your pool properly circulated. In warm weather...
Learn More -
Do You have to Cover a Pool in the Winter?
Winter in Arizona is milder than many parts of the country. However, we hear from pool owners every year: “Do I really need to cover my pool?” Many homeowners across...
Do You have to Cover a Pool in the Winter?
Winter in Arizona is milder than many parts of the country. However, we hear from pool owners every year: “Do I really need to cover my pool?” Many homeowners across...
Learn More -
What Raypak Heater Error Codes Mean and How to ...
If you’ve ever glanced at your Raypak heater and seen codes like BD1, PRS, or HL1 blinking back at you, we understand how confusing they can be. Half the time,...
What Raypak Heater Error Codes Mean and How to ...
If you’ve ever glanced at your Raypak heater and seen codes like BD1, PRS, or HL1 blinking back at you, we understand how confusing they can be. Half the time,...
Learn More



