SMC KQ2S04-M5A Brass Push-to-Connect Tube Fitting, Hex Socket Head Adapter, 4 mm Tube OD x M5x0.8 Male Male adapter to connect a tube to a female thread Push-to-connect metric tube connection on one end and male metric (M) threads with a gasket seal on the other end Brass body and threads for resistance to corrosion Operating pressure range of -14.5 to 145 psi (-100 kPa to 1 MPa) Operating temperature ranges of 23 to 140 degrees F (-5 to 60 degrees C) (ambient) and 32 to 104 degrees F (0 to 40 degrees C) (fluid) This product is not intended for use in potable water systems