PGJ 06-04 is a push to connect plug-in reducer fitting, having one hose connection of 4mm, and stem which can be pushed into another push-in fittings with larger diameter of 6mm.
Pneuflex has official distributors in 30+ countries.
A Reliable Manufacturer - Composite Push in Fittings China

PGJ 06-04 is a push to connect plug-in reducer fitting, having one hose connection of 4mm, and stem which can be pushed into another push-in fittings with larger diameter of 6mm.
316 Stainless Steel Push in Fittings for Metric / Inch Tubing, PT, R, BSPT Connection Thread
316 Stainless Steel Push in Fittings for Metric / Inch Tubing, BSPP, G Male Thread
316 Stainless Steel Push in Fitting for Metric / Inch Tubing, NPT Connection Thread
316 Stainless Steel Push in Fittings for Metric / Inch Tubing, Metric (M) Connection Thread