There are six main attributes used to selecting a Push to Connect fittings;
•Fitting Connection - Tube to Tube, Tube to Thread, Stem to Hose Barb, Stem to Thread, Stem to Tube, Stud to Stem
•Fitting Type - adaptor, coupling, elbow. tee, ...
•Material - Nickel plated brass, grey acetal, Polybutylene
•Inch/Metric
•Termination - Hose Barb ( Hose ID ), Male NPT, Female NPT, Tube (OD), Stem (OD)
•Dimension - 1/4", 3/8", 1/2"...