CMP | 25543-004-000 | 1.5" MPT Black Pool Plug with O-Ring | Replacement Pool Winterizing Plug

This pool plug is a replacement sealing component designed for compatible pool plumbing, return, inlet, and winterizing applications. The 1.5" MPT connection supports threaded installation, while the included O-ring helps create a secure seal in compatible fittings.

Built for pool service, seasonal closing, equipment maintenance, and repair applications, this black plug is commonly used when a threaded pool fitting needs to be sealed temporarily or during routine maintenance.

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Key Features

• Replacement pool plug for compatible threaded pool fittings

• 1.5" MPT connection for matching threaded plumbing and wall fitting applications

• Includes O-ring to help support a secure seal in compatible installations

• Black finish coordinates with select pool interiors and wall fitting components

• Used for winterizing, service work, pressure testing, and temporary fitting closure

• Suitable for pool return fittings, inlet fittings, and compatible plumbing openings

• Replacement component for worn, cracked, missing, or damaged plugs

• Proper fitment and sealing should be verified before use in any pool plumbing application

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Product Overview

This pool plug is used to seal compatible threaded pool fittings during maintenance, winterization, or service work. It installs into a 1.5" MPT-compatible opening and uses an O-ring to help create a sealed connection when properly tightened.

The plug is commonly used during pool closing to help block return or inlet lines after water has been lowered or lines have been prepared for winter conditions. It can also be used during equipment service, plumbing inspection, pressure testing, or temporary closure of compatible openings.

During installation, the fitting threads, O-ring, sealing surface, and plug body should be inspected for damage, debris, or wear. The plug should be tightened securely by hand or according to the application requirements without over-tightening, which could damage the threads, O-ring, or fitting body.

Routine maintenance should include checking the plug and O-ring for cracking, flattening, brittleness, or chemical wear before reuse. Maintaining the plug in good condition helps support reliable sealing, protects pool plumbing during service, and reduces the risk of leaks in compatible applications.