Converter (metric/inch) – Double Union

John Guest metric-to-inch converter

Straight union designed to connect 15 mm metric tube to inch-size tube. Available variants provide transitions from 15 mm to 3/8" or from 15 mm to 1/2".

Why a converter is needed

Metric and imperial sizes should not be interchanged by approximation. A 15 mm tube is not equivalent to 1/2" or 3/8"; this fitting provides the specific transition.

Applications

Useful when integrating equipment and water, marine or beverage dispensing installations that use different tubing standards.

Installation

Clearly identify each side, cut both tubes square and insert them fully to the stop. Avoid tension that tries to pull the tubes in opposite directions.

Frequently asked questions

Which side is metric?
15 mm.

Which imperial options are available?
3/8" and 1/2".

Can I connect 15 mm directly to 1/2" without a converter?
No. They should not be treated as equivalent sizes.

Can it be used to adapt existing installations?
Yes, that is one of its main uses.