Pentair LA375 drain plug o-ring for Letro booster pumpsPentair O-Ring, Drain Plug In stock$499
Pentair LA375 drain plug o-ring for Letro booster pumps
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Pentair O-Ring, Drain Plug

Ask a questionMPN LA375 / O-446
$499
In stock
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Quick overview

  • Genuine Pentair The factory drain plug seal for the Letro booster pump.
  • Two part numbers Pentair lists this o-ring as LA375 and also as O-446. Both refer to this seal.
  • New style This is the current, new style drain plug o-ring.
  • Rubber Moulded rubber, sized to the drain plug seat rather than a generic ring.
  • Fits the Letro booster pump Used on the Pentair Letro LA01N booster pump.
  • Stops a slow weep A hardened drain plug o-ring drips at the pump base and lets air into the suction side.
Full description and specifications ↓

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Product details

This is the genuine Pentair drain plug o-ring for the Letro booster pump, the new style seal. Pentair carries it under two numbers, LA375 and O-446, and both point at this part.

What it seals

The drain plug at the bottom of the booster pump volute. That plug comes out at every winterization and goes back in every spring, and its rubber o-ring is what stops water passing the threads.

The symptom

A slow drip or a wet patch under the pump that will not stop no matter how hard the plug is tightened. Once the o-ring has hardened and taken a permanent set, extra torque only cracks the plug or the housing. A fresh seal is the fix.

Fitting

Wipe the seat clean, put a thin film of silicone lubricant on the new o-ring, and hand tighten the plug. It does not need to be forced.

Specifications
Brand Pentair
Manufacturer part number LA375 / O-446
UPC 807318005334
Part type Pool pump part
Type O-ring, drain plug, new style
Material Rubber
Fits Pentair Letro booster pump LA01N
Shipping weight 0.05 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

Why are there two part numbers?
Pentair lists this o-ring under both LA375 and O-446. They are the same drain plug seal, so an order against either number lands here.
Is this the old style or the new style?
The new style drain plug o-ring.
Which pump does it fit?
The Pentair Letro LA01N booster pump, the pump that drives a pressure side cleaner.
My pump drips at the plug. Is this the fix?
Usually. The o-ring hardens and takes a set, so the plug no longer seals even when tightened. Fit a new one and lubricate it lightly with silicone before the plug goes back in.
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