Pentair Drain Plug Assembly with O-Ring
Product Overview
The exact OEM specification for sealing Pentair MasterTemp and Max-E-Therm heater manifolds.
Technicians reach for genuine Pentair OEM drain plug assemblies (part 460748) when winterizing or servicing MasterTemp and Max-E-Therm pool heaters. Molded from thermal-stabilized composite polymer, this assembly includes the factory-spec nitrile O-ring to ensure a watertight seal up to 50 PSI operating pressure without stripping delicate header threads.
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Benefits & What Makes It Different
OEM Manifold Thread Spec
Engineered with factory-matched composite threads to prevent galling or cross-threading expensive MasterTemp header manifolds.
70-Durometer Nitrile O-Ring
Includes the pre-fitted OEM O-ring that seals completely against the manifold face under standard 30 to 50 PSI operating pressures.
Thermal & Chemical Resistance
Constructed from high-grade polymer rated to withstand internal heater operating temperatures exceeding 104°F and direct chemical exposure.
Compatibility
- Pentair MasterTemp 125, 250, 300, and 400 Natural Gas and Propane Heaters
- Sta-Rite Max-E-Therm SR200, SR333, and SR400 Heaters
- Replaces Pentair / Sta-Rite OEM Part Numbers 460748, 071131, and U178-920P
When To Use This
Pro Tip
Always apply a thin film of 100% silicone pool lubricant to the nitrile O-ring before threading it in. Hand-tighten completely and snug it only 1/4 turn with a wrench—never use petroleum-based lubricants, which swell and destroy the O-ring within 60 days.
Common Questions & Instructions
How often should I replace the Pentair MasterTemp drain plug and O-ring?
In our experience, you should inspect the O-ring annually during fall winterization and replace the complete assembly every 2 to 3 years. Operating temperatures up to 104°F and seasonal removal cause the rubber O-ring to flatten and composite threads to wear over time.
What tool and torque should be used to install this drain plug?
Thread the plug in by hand until the O-ring contacts the manifold seat, then tighten only 1/4 turn past finger-tight using a standard wrench. Over-torquing beyond 1/4 turn can pinch the nitrile O-ring or crack the heater manifold header.
Can I use Teflon tape instead of the OEM O-ring on this Pentair plug?
No, do not use Teflon tape in place of the factory nitrile O-ring. The O-ring provides the primary radial seal on the manifold face; wrapping tape around the composite threads creates outward pressure that can split the header casing under 30 PSI.
Delivered today to your DFW neighborhood
Order this item by 2 PM Central on a weekday, and we'll have it on your driveway by evening. Same-day delivery is FREE to every ZIP in our DFW coverage area — no minimum — or it's free with our weekly service plan.
