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: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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