3/8" tube bulkhead union push in fitting is used on when you need to move tubing through some obstacle, or mount it to some kind of board. Simply drill a hole, and screw on bulkhead push in fitting, and then connect air hose on the both sides.
Composite Push in Fittings (PT, R, BSPT Thread)
PM 3/8 | 3/8 Tube Bulkhead Union Push in Fittings
Looking for 316 Stainless Steel Push in Fittings ?
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316 Stainless Steel Push in Fittings for Metric / Inch Tubing, PT, R, BSPT Connection Thread
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316 Stainless Steel Push in Fittings for Metric / Inch Tubing, Metric (M) Connection Thread