Unions for Aquariums

An aquarium union fitting is great for hard plumbing an aquarium return pump or aquarium drain, while still allowing the aquarium manifold to be disassembled.

PVC fittings are listed according to PVC pipe sizes, not the actual measurement of the part. So, a 1 inch slip elbow does not measure 1 inch but fits onto 1 inch PVC pipe. PVC fittings are categorized by the types of connections they make:

MPT, or male pipe thread, has threads on the outside wall
FPT, or female pipe thread, has threads on the inside wall
A PVC slip fitting, or slip fit, has no threads and connects to PVC pipe
PVC insert fittings, or hose barb fittings, connect to aquarium tubing (not flex PVC pipe)
A reducer fitting reduces PVC size
7 Results
Spears Union Fitting - 1 Inch Slip x 1 Inch Slip

Spears Union Fitting - 1 Inch Slip x 1 Inch Slip

Spears Union Fitting - 3/4 Inch Slip x 3/4 Inch Slip

Spears Union Fitting - 3/4 Inch Slip x 3/4 Inch Slip

Spears Union Fitting - 1-1/2 Inch Slip x 1-1/2 Inch Slip

Spears Union Fitting - 1-1/2 Inch Slip x 1-1/2 Inch Slip

Spears Union Fitting - 1 Inch FPT x 1 Inch FPT

Spears Union Fitting - 1 Inch FPT x 1 Inch FPT

Spears Union Fitting - 2 Inch Slip x 2 Inch Slip

Spears Union Fitting - 2 Inch Slip x 2 Inch Slip

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