Compact (miniature) one touch fittings of union straight is used to connect two air hose tubes of equal diameters in the same direction. Mini push in fitting union straight is compact designed, ideal for confined space. You can install them where normal pneumatic fittings are not are not sufficiently compact. The body of compact pneumatic fitting union straight is made of PBT, stainless steel retaining claws which securely retain the tubing and NBR sealing ring between the tubing and body of the fitting which forms a perfect seal. Miniature push to connect fittings are available for tube diameters from 3 mm, 4 mm and 6 mm. Working pressure from 0~1.0 Mpa (0~150 psi). Working temperature from 0~60ºC (32~140ºF). Miniature push in fittings are suitable for miniature cylinder, miniature gripper, miniature solenoid valve and 3D printer.