Expansion Plugs / Gizzmos

Swimming pool plugs come in all shapes, sizes and colors, and they're used for many different purposes in the pool and for pool equipment. At Pool Center, you will find all kinds of pool plugs to suit any need. We carry winterizing plugs including skimmer plugs, expansion plugs, threaded pool plugs, one-way valve plugs, test plugs and equipment plugs.

Pool plugs are a perfect winterizing accessory when you want to protect your costly equipment from damage, especially when the weather turns harsh and your pool is not in use. Swimming pool plugs are used for many different purposes around the pool, and they help protect your pool equipment and plumbing lines from damage.

Winterizing Plugs:

These are the most common type of pool plugs and are also known as freeze plugs or expansion plugs. Winterizing plugs are basically tapered rubber plugs with two stainless steel washers and a bolt passing through the center, and can be used to plug the pool pipes after draining or blowing them out to protect them from freeze damage. They are used as pipe plugs to plug skimmers, returns and cleaner lines to prevent water from entering the pipes during winterxpansion plugs have other uses too, such as pressure testing and leak detection for pool lines, or to stop water flow from the pool while equipment repairs are made.

Skimmer guards are another type of winterizing plug used to keep water out of the lines and absorb ice expansion inside the skimmer. The gizzmo breaks up the ice pack in the skimmer and collapses inward to absorb the strong force of expanding ice.

Filter Plugs:

Filter plugs are basically used to drain water from a filter, and different manufacturers use different plugs on their pool filters.

Pump Plugs:

Pool pumps usually have two drain plugs. One is in the front, at the base of the hair and lint strainer or the pump pot, and another plug further back towards the motor, to drain the volute or impeller housing.

Heater Plugs:

Pool heater plugs are found on both sides of the heat exchanger or on the front header. Cast iron headers or bronze headers use a 1/4 in. brass plug or butterfly valve plug, whereas the modern thermoplastic headers use a plastic plug, usually with an o-ring. Brass plugs should be lubed with green lube, like Aqua-Lube, to keep the rust from building up on the threads of the cast iron headers.

Test Plugs:

Test plugs are used primarily for pressure testing plumbing. They look similar to winterizing plugs, except that they are not tapered, the sides are straight, and they have oversized wing nuts to allow for strong tightening.