Pentair Booster Pump O-Ring Drain Plug | LA375
Pentair
SKU: LA375
Pentair / Letro Booster Pump Drain Plug O-Ring (New Style) | LA375
The Pentair LA375 is a replacement drain plug O-ring used on select Pentair/Letro booster pumps. It seals the pump’s drain plug to help prevent drips and suction-side air leaks after servicing or winterization. Replacing a flattened, cracked, or swollen O-ring is a quick fix for seepage around the drain plug area.
Compatibility
- Pentair / Letro Universal Booster Pump: LA01N (commonly referenced on parts diagrams)
- Pentair Universal Booster Pump (parts lists): EC-LA01N assemblies where LA375 is specified
- Tip: Match your existing drain plug O-ring style to your pump’s parts diagram (some older pumps used a different “old style” seal).
Key Features
- Stops drips at the drain plug by restoring the proper seal.
- Helps prevent air intrusion that can affect priming and consistent operation.
- Direct replacement O-ring for booster pump drain plug service points.
- Simple maintenance part—ideal to replace any time the drain plug is removed.
Specifications
- Brand: Pentair
- Part Number: LA375
- Part Type: Drain plug O-ring
- Common Catalog Reference: 3285-60
- Common O-Ring Reference: O-446 (as listed by many suppliers)
- Quantity: Sold individually
When to Replace
- Water drips or seepage around the drain plug
- O-ring is flattened, cracked, brittle, nicked, or swollen
- Drain plug won’t seal consistently even when snug
- After freeze events or anytime the plug has been removed repeatedly
Installation Notes
- Turn off power to the pump at the breaker and relieve system pressure before servicing.
- Remove the drain plug, then remove the old O-ring and clean the plug groove and sealing surface.
- Lightly lubricate the new O-ring with silicone pool lube (never petroleum-based) and seat it evenly without twisting.
- Reinstall the drain plug snugly—avoid over-tightening, which can damage threads or deform the seal.
- Restart and inspect for leaks under normal operating pressure.
Related Products
- Search Aqua Pool Supply for LA375
- Booster pump drain plugs
- Silicone lubricant for O-rings and seals
- Pentair booster pump parts
Maintenance Tips
- Inspect drain plug O-rings at the start and end of each season—small seals often fail before larger gaskets.
- Keep a spare O-ring on hand if you winterize annually or service the pump frequently.
- Never over-tighten plastic plugs; a clean sealing surface and a lubricated O-ring do the sealing work.
- In freeze-prone areas, fully drain the booster pump and remove plugs if recommended to prevent housing damage.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 8:00 am to 4:00 pm Phoenix Time
Saturday and Sunday: Closed
- Orders costing more than $300 WILL be required to have signature confirmation upon delivery.
- Handling time is typically only 1 day.
- Any item ordered after 1pm Phoenix time, may not ship same-day.
- Call us if you require expedited shipping and we can give you quotes based on your needs.
Return Policy:
- All products, except as noted below, are eligible for return up to 30 days after receipt of item.
- For returns, an RMA form must be filled out HERE or customers can call for additional help.
- Shipping costs will be deducted from all returned items.
- Any item that is missing accessories, original packaging, or is not returned in the same condition that it was received in, may be subject to a re-stocking fee up to 100% based on the condition we receive it in.
- Items broken, damaged, or inoperable due to installer error will not be refunded.
- Fill out the return form or give us a call to obtain an RMA and return shipping label.
- There are no returns on the Pentair Colorsync 618031
- No returns on pool cleaners.
- No returns on opened seals and o-rings.
- No returns on capacitors.
- If a light is returned because it "doesn't work" and it tests fine, the cost to ship and a re-stocking fee will be deducted from the refund.
- All products denied upon arrival at customers house WILL be charged the cost to ship.
- Visa Gift Card Promotions: Gift cards are sent within 14 days of the order. When accepting the Visa Gift card, you agree that if your order is returned or refunded, this amount will be deducted from the refunded amount. All Visa Gift cards are sent via email in an E-Gift Card format and are non refundable.
Related Products
