PVC Unions

A PVC union is a type of pipe fitting that allows you to connect and disconnect two sections of pipe without making any cuts. This fitting consists of two end pieces that are attached to the pipes and a central threaded nut that tightens to join them together. You can pick up Aqualine PVC pipe unions from Sprinkler Warehouse today when you order on our website.

How do PVC Unions Work?

PVC unions are unlike other fittings, as they create a connection that can be detached and reattached whenever necessary. Each side of the union is first attached to a pipe by applying PVC glue. The union also uses a central nut with a sealing surface, typically an O-ring or gasket. When the nut is tightened, it pulls the two ends together, compressing the seal to create a watertight connection. To disconnect, you simply loosen the nut, and the two sides separate cleanly. Unlike permanent fittings, the connection doesn’t rely solely on adhesive, so it can be undone without cutting the pipe. This design is especially useful in systems where maintenance or equipment removal may be required.

PVC Union FAQs

How does a PVC union differ from a coupling?

A PVC union and a PVC coupling may look similar, but they serve different purposes in an irrigation or plumbing system. A coupling is used to permanently join two pieces of PVC pipe together in a straight line. A union, on the other hand, is designed for easy disassembly and maintenance. This makes unions ideal for areas where you may need to service or replace components.

What sizes do PVC unions come in?

PVC unions come in a wide range of sizes to match the standard PVC pipe dimensions. The most common sizes range from 1/2 inch up to 2 inches, with the most frequently used sizes in residential irrigation being 1/2", 3/4", 1", and 1-1/2". They’re designed to match the pipe’s nominal size, ensuring a proper fit with standard PVC fittings.

Do PVC unions require glue or sealant?

Yes. The outer ends of the union (where it connects to the PVC pipe) usually require PVC primer and cement to create a permanent, watertight bond. The center threaded section, however, does not require glue or thread sealant. It seals using an internal O-ring or gasket, making it easy to disconnect later for maintenance or repairs.

PVC Unions

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How do PVC Unions Work?

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