John Guest double union
Straight fitting to join two tube sections of the same diameter using push‑fit quick connections.
Available sizes
The family includes 3/16", 1/4", 5/16", 3/8", 1/2", 10 mm and 15 mm, depending on the variant.
Applications
Useful for extending a line, replacing a damaged section or creating a detachable joint between two compatible runs.
Installation
Cut both ends square, check that they are the same size, and push in fully. Do not use the coupling to compensate for misaligned tubes.
Frequently asked questions
Are both sides the same?
Yes.
Are there metric sizes?
Yes, 10 mm and 15 mm.
Can I mix metric and imperial?
Not with an equal union; use a specific converter.
What should I check if it leaks?
Cut, insertion, size, and condition of both tubes.