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Pentair

Pentair Booster Drain Plug Pump O-Ring LA375

Pentair Booster Drain Plug Pump O-Ring LA375

$2.99 USD
$2.99 USD
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The Pentair LA375 Booster Pump O-Ring Drain Plug restores the seal in the pump housing that maintains proper system pressure. This essential replacement part ensures the drain opening stays watertight while still allowing easy seasonal draining or servicing when needed. Designed as a genuine Pentair replacement component, it fits precisely in compatible booster pumps used with pressure-side pool cleaners. With a durable O-ring seal and corrosion-resistant construction, it helps keep your cleaner booster pump running efficiently.

What does the Pentair LA375 booster pump drain plug do?

The Pentair LA375 drain plug with O-ring seals the pump housing drain port on Pentair booster pumps. It prevents water from leaking out of the pump body while the system is operating under pressure. When removed, the plug also allows technicians or pool owners to drain the pump for maintenance or winterization.

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Key Features

  • Genuine Pentair Replacement Part – Designed for compatible Pentair booster pumps
  • Integrated O-Ring Seal – Creates a tight, leak-free connection at the pump drain port
  • Quick Installation – Threads easily into the pump housing without special tools
  • Durable Chemical-Resistant Materials – Withstands pool water and cleaning chemicals
  • Prevents Air Leaks & Water Loss – Maintains proper pump performance and pressure
  • Ideal for Pump Maintenance – Perfect replacement for worn, cracked, or missing drain plugs
  • Supports Seasonal Winterization – Allows easy draining when servicing pool equipment

Technical Specifications

  • Brand: Pentair
  • Part Number: LA375
  • Product Type: Pump Drain Plug with O-Ring
  • Application: Booster Pump Maintenance / Replacement
  • Material: Durable polymer with rubber O-ring
  • Installation: Thread-in replacement

Specs

Best For: Pentair Booster Pump Maintenance & Leak Repairs

The Pentair LA375 drain plug is a simple but essential replacement part used during routine pool equipment maintenance. Booster pumps—especially those powering pressure-side cleaners—rely on a sealed pump housing to maintain proper pressure. If the drain plug or O-ring becomes worn, cracked, or loose, small leaks can develop that reduce pump efficiency or create air intrusion.

Replacing the plug restores a proper seal and prevents slow water loss from the pump body. It’s a common repair performed by service technicians when preparing pumps for seasonal startup or when fixing minor leaks discovered during equipment inspections.

Best for
Pentair booster pump repairs
Pressure-side cleaner booster pumps
Seasonal equipment maintenance
Fixing small pump housing leaks

Not ideal for
Main circulation pool pumps
Non-Pentair booster pump models
Damaged pump housings requiring larger repairs

Expert Comparison & Pro Tips

Drain plugs are often overlooked during pump maintenance, but they play an important role in maintaining a sealed pump housing. A worn or flattened O-ring can allow small air leaks that reduce pump performance or cause priming issues. Replacing the entire plug assembly ensures both the threads and sealing surface are in good condition.

OEM Pentair plugs like the LA375 are designed with the correct thread pitch and sealing dimensions for compatible pumps. Aftermarket plugs may fit loosely or use lower-grade O-rings that wear out faster.

Pro Tip:
When replacing a drain plug, apply a small amount of pool-safe silicone lubricant to the O-ring. This improves the seal and prevents the gasket from drying out or sticking during future maintenance.

How do you know if your booster pump drain plug needs replacement?

Signs that a booster pump drain plug needs replacement include water dripping from the drain port, visible cracks in the plug, or a flattened O-ring that no longer seals tightly. If tightening the plug no longer stops the leak, the O-ring has likely worn out and the plug should be replaced.

Pro Tip:
Many pool service pros replace drain plug O-rings during routine pump service to prevent leaks before they start.
Dan Shasta Pool Supply Expert

Our Expert Verdict: A Small Part That Prevents Bigger Pump Problems

The Pentair LA375 Booster Pump O-Ring Drain Plug may be a small component, but it plays a critical role in keeping your booster pump sealed and operating efficiently. Replacing worn drain plugs is one of the easiest ways to eliminate small leaks and maintain proper pump pressure.

For service technicians, it’s a quick repair that can restore pump performance in minutes. For pool owners, it’s a simple preventative replacement that helps protect expensive equipment from unnecessary wear.

At ShastaPoolSupply.com, we stock genuine Pentair replacement parts backed by expert guidance and fast shipping—so you can keep your pool equipment running smoothly all season long.

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What our customers are saying

Thank you, Dan for making the process so simple and giving me the part at such a great price.

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Ordering and payment was simple and easy to do. Dan is wonderful.

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Fast pickup. The guy who helped me had a great attitude!

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