A single fitting offers secure connections and quick disconnectionno need to purchase two fitting halves. Simply push tubing past the O-Ring to the internal tube stopsteel teeth on the collet grip tubing for leak-proof connections. To Disconnect, press collet against fitting body to disengage steel teeth tubing slides right out. Fittings work with semirigid plastic (polypropylene, polyethylene, nylon) and soft metal (Brass, copper, mild steel) tubing. To connect flexible tubing such as Tygon or silicone, order soft tube supports. Meet NSF and compliance for food-grade applications. Quick-disconnect convenience for a wide variety of tubing materialincluding soft metals!.