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I quit buying bulkheads for low-pressure applications. They are available here at the local feed/aquaculture store, but they are just too expensive for every day tinkering around - especially in the larger sizes.
Instead, I use a PVC male and female adapter. EPDM gaskets sized to fit PVC male adapters can be found at the local hardware, but it is less expensive and more convenient to cut gaskets from a sheet of 1/8-inch red gasket material.
The male and female adapters have a slight taper on the threads so they will snug-up properly when used for typical applications. However, this taper prevents the male adapter from threading all the way into a female adapter and leaves a gap wider than is usually needed for one or two gaskets and the wall thickness of an aquarium, fiberglass or plastic tank. Therefore, it is often necessary to cut a small spacer ring from the end of a slip-fit pipe fitting. The spacer ring also provides more "hip" for the gasket to seat against if the brand of male adapter you are using does not have enough hip molded into the fitting.
Most hole saw kits are sized to accommodate male adapters for standard pipe sizes up to 2-inch. For larger sizes I use a jig saw to cut the hole.
For anything less than about 8 feet of head, this arrangement does not leak.
-stevehopkins
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