Low Pressure Male Union ®ets^ Low-Pressure unions are straight shaped with standard 1/4-28UNF male threads at both sides, black PPS colored, 2mm flow channel that used for female 1/4-28 flat bottom. PPS materials featured with high strength even under wide temperature range -50'C~+150'C, excellent heat and chemical resistance to transfer different chemical solvents Precise standard thread to match with female ports to ensure good tightness and high reliability Come with our female connectors and bulkheads to realize the connection of different types of tubes Barb-to-Female Adapter Elbow Barb-to-Female Adapters are used to navigate tight corners for flexible tubing transited to rigid tubing. One end is for connecting flexible tubing ID2.4-3.2mm, another end is for connecting flanged or flangeless fittings for rigid tubing. Straight Barb-to-Female Adapters are used to transit flexible tubing into rigid tubing. One end is for connecting flexible tubing ID0.8-3.2mm, another end is for connecting flanged or flangeless fittings for rigid tubing. Model No. Thread Materia NI06-24-28E Barb-to-Female adapter made of 1/4-28UNF female thread, PTFE material, suit for flexible tubing ID1.6-2.4mm Model No. Tubing ID Thread N L05 - Elbow Barb-to-Female Adapter 16 - 1.0~1.6mm 28 -1/4-28U N F N106 - Straight Barb-to-Female Adapter 24 -1.6-2.4 mm