Parker's Poly-Tite fittings are engineered for quick and easy installation. The fittings come pre-assembled with the body, nut, and sleeve ready for use. The acetal copolymer sleeve is designed to resist creeping and stress from compression, while also offering excellent dimensional stability and protection against UV rays. The Poly-Tite nuts rotate around the sleeve as they tighten, preventing twisting and weakening of the plastic tubing. These fittings can be assembled and disassembled repeatedly without compromising their integrity.Next Day Fittings is an official Parker distributor, we can offer our customers the best pricing and factory lead times. Our trained and knowledgeable staff is always ready to help with any aspect of the Parker product purchasing process. Whether you need assistance from a customer service agent or a product engineering expert, Next Day Fittings is your Parker partner every step of the way.