High Quality Quick Connect Air Hose Fitting Kit is made of high quality Polybutylene Terephthalate (PBT) with stainless steel locking pliers and high quality steel washers, designed for durability and repeated use. Resistant to high pressure and environmentally friendly, it can withstand strong pressure without failure. The 37-Piece Air Hose Fitting Kit includes: 12 straight push-on connectors with NPT thread, 9 x 90-degree elbow connectors, 6 inline connectors, 5 T-fittings, 5 90-degree elbow NPT thread connectors, 6 straight couplings, and additional 90-degree elbow and T-fittings. Pneumatic fitting sizes: 1/2 inch, 3/8 inch, 1/4 inch. All components are organized in a durable, lightweight plastic storage container with flip-top locking tabs for secure, rust-resistant storage. These push-to-connect air fittings are compatible with PU, PA, PE, and PVC tubing or hoses. Ideal for use in automotive, manufacturing, truck and trailer maintenance, as well as garden and lawn care applications. Designed for easy installation, the push-in fitting system allows for quick connection. Simply insert the hose into the fitting for an immediate secure seal. Disconnection is achieved by pulling the hose out. Maximum Working Parameters: Fluid Type: Air, Vacuum. Operating Pressure: 0 to 145 PSI (0 to 0.9 MPa). Burst Pressure: 1.32 MPa. Temperature Range: 0°C to 60°C (32°F to 140°F). High pressure resistant with long service life.