Brennan PCNY2403-06-04 PBT Push-to-Connect Tube Fitting, Reducing Coupler, 3/8" Tube OD x 1/4" Tube OD Reducing coupler for connecting two pipes with different diameters Push-to-connect fitting connects to pipes or tubing on both ends Made of polybutylene terephthalate (PBT) for resistance to solvents, shrinkage, heat, and impact Working pressure of up to 290 psi Operating temperature ranges from -4 to 175 degrees F