Package: You get 20 pieces pipe fitting assortment kit in 5 sizes, NPT 1/8Inch, NPT 1/4Inch, NPT 3/8Inch, NPT 1/2Inch, NPT 3/4Inch, 4 pieces/size, storage in a box for your industrial needs. Made from great 304 stainless steel with superior acid-resistance, anti- and high strength, strong texture, high hardness, standard thread, not easy to slip. A mechanical fasteners, the role is sealing. Male National Pipe Taper (NPT) threads for using with female threaded pipes; Male pipe threads for connecting to female threaded pipes or fittings. Hex threaded design for quickly installation and removal. Suitable for closing the ends of the pipe or tube. Countersunk plug with a hex drive for closing of a pipe or fitting. 5 sizes pipe plugs for different needs. Not only work great on preventing leakage of air, steam, gases, water, oil and fluids under pressure, but also great for blocking off intake manifold water ports, water pump ports, water temp and oil sender holes, engine block holes, etc. No gasket required for these npt thread plug pipe; tape and thread sealant are recommended for threaded joints. Designed for use in air, water, oil, nature, manufactured, mixed, liquefied petroleum or propane and LP Gas-Air. Stainless Steel for resistance, ductility at high temperatures, and low magnetic permeability. Stainless Steel air fittings, NPT end used to connect NPT pipes, is which can apply to water, gas, oil and fuel as well as air tools. Temp Range:-65 to 250 Maximum Pressure:1000 PSI Groove:Internal Hex Colour:B:Silver Quantity & Material:20 Pieces, steel Size:NPT 1/8inch 1/4inch 3/8inch 1/2inch 3/4inch Package Contents: 1set * 2 inch pvc fittings Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.