John Guest 3/8" T shut‑off valve
T-branch shut-off valve for 3/8" (9.5 mm) tube, combining distribution and manual control of a branch in a single component.
When to use it
It is useful when a main line needs a branch that can be opened or closed independently.
Installation
Plan the orientation so that the handle is accessible, cut the tubes square and insert fully. Check for leaks at all three connections.
Maintenance
Operate the valve periodically and check that the branch is not exerting leverage on the body.
Frequently asked questions
What tube does it use?
3/8".
Is it just a divider?
No, it includes manual flow control.
Can I use 10 mm tube?
Equivalence with 3/8" must not be assumed.
What advantage does it offer?
It combines branch and shut‑off in a single piece.