3/8" to 5/16" union branch reducer is a manifolds push to connect tube fitting, connecting two different tube size of which size of two tubes at both ends is 3/8", three tubes at 90° angles is 5/16".
Pneuflex has official distributors in 30+ countries.
A Reliable Manufacturer - Composite Push in Fittings China

3/8" to 5/16" union branch reducer is a manifolds push to connect tube fitting, connecting two different tube size of which size of two tubes at both ends is 3/8", three tubes at 90° angles is 5/16".
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