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Click here first to search our How To Guides for answers to the most frequently asked questions regarding pool kits, pool equipment and more!

The measurement of the thickness of the PVC pipe. Taken from the outside to the inside of the pipe section. This measurement changes between each Schedule of PVC piping.

The measurement of the pipe from top to bottom, or left to right. Taken from the outside edges of the pipe section. This measurement is not your PVC pipe size.

The measurement of the pipe from top to bottom, or left to right. Taken from the inside opening of the pipe section. This measurement is equal to your PVC pipe size.

Schedule 80 PVC pipe is only compatible with external fit fittings. Internal fit fittings, such as Internal Dome Caps, Adjustable Elbows, Internal Couplings and other fittings that fit inside of the PVC pipe will not work with SCH 80 PVC due to the smaller internal diameter.

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The size of your PVC pipe is identified using the inside diameter measurement of the pipe - this measurement is known as 'Nominal'. One of the issues that is commonly encountered when trying to measure pipe size is that the outside diameter of the pipe is often measured, giving you a completely different (and larger) PVC pipe dimension then what you actually require.

Thinwall PVC pipe is only compatible with external fit fittings. Internal fit fittings, such as Internal Dome Caps, Adjustable Elbows, Internal Couplings and other fittings that fit inside of the PVC pipe will not work with Thinwall PVC due to the larger inner diameter.

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