Overview Product Description Buyers Products Union Connectors are made of They are designed to meet DOT FMVSS 571.106 air brake performance specifications. Product Videos Custom Field Shipping Free shipping on orders $100+ Product Reviews Write a Review Write a Review × BUC0P25 - Brass DOT Push-In Union Connector 1/4 Inch Tube O.D. Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *