F-3355 Series Swivel Tee has barbed tee that can swivel 360 degrees. There is no parting line on the first barb. It is the innovative design of the 1/4-18 NPT Swivel Fitting that enables the swiveling of the barb in the threaded base. The threads themselves are sealed using either Teflon Tape or EverSeal 483. It is possible to buy barbs with 1/16", 3/32", or 1/8" I.D. flexible tubing. It is a snap-type fitting, which is then sealing using Buna-N, Ethylene Propylene (EPDM), or Viton o'ring. The mounting on the 1/4-18 NPT Swivel Fitting are precision molded on nylon. The maximum supply pressure is 125 psi. Pperating temperature range is -50 degrees to 180 degrees F. The housing and barb is made of nylon, while the O-ring is made of Buna-N, Ethylene Propylene, or Viton.