Designed for Polyurethane or Nylon tubing. Quick and Reliable connections. Reusable: Multiple connections/disconnections. Convenient elliptical sleeve configuration. Metallic body made of non-corrosive, non-contaminant Nickel-plated Brass. Pre-coated threads are ready to use without additional sealing. Hexigonal/Allen wrench tightening. Specifications: Fluid Type: Air, Metallic Body: Nickel-plated Brass, O-Ring: NBR (Acrylonitrile butadiene rubber), Plastic Body: PBT (Polybutylene terephthalate) Packing: NBR (Acrylonitrile butadiene rubber), Back Ring: POM (Polyoxymethylene plastic), Lock Claws: Stainless Steel, Collar: Zinc Alloy, Sleeve: POM (Polyoxymethylene plastic).