Quality MaterialOur air hose fittings are made of PBT plastic, DOT approved air brake brass fittings are made of high quality CA360 brass, corrosion resistant, high temperature ductility and low permeability. Perfect for long time use. [QUANTITY]:Unique Point Air Line Quick Connect Fittings Nylon Tube Kit:Plastic tube fittings contain 28 pieces: 8 pieces male straight push connectors, 6 pieces straight tube couplings. 6 pcs 90 degree elbow. 4 pcs 90 degree elbow NPT thread. 4 pcs. tubular t-shirt. Brass Tube Fitting contains 16 pieces:5 pcs male connector. 5 Pieces 90 Degree Male Connector. 3 Pieces Tubular Tee. 3 Tube T-Shirts. 3 Pieces Tube Fitting. Fit type:1/2 inch, 3/8 inch, 1/4 inch. [Typical Application]:Press fitting, 1/4 inch (approx. 0.6 cm) for PU/PA/PE/PVC. Classification of point air fittings can be used for copper tubing in air systems and air brake systems. Widely used in automobile, manufacturing line, car or truck repair, industrial workshop, daily garden or lawn repair, tractor hose connection and so on. [EASY TO INSTALLOur air fitting kits allow for quick disconnection of connecting tubes, no tools or loose parts are needed to operate in tight places. Save your energy and time. Parts containing threaded ends are pre-applied with sealant to provide a secure connection. After-sale:If you are not satisfied with our air hose fittings combination, please feel free to contact us as we will provide you with a replacement or full refund. Our desire is to bring you the best shopping experience.