Tri-Fitt Ultra-High Pressure Fittings for HPLC applications that require no leaks at pressures at or above 20,000 psi. The fittings kit is designed with 3 separate parts which include a black carbon-PEEK ferrule, a stainless steel triangular ferrule and a stainless steel nut. The carbon PEEK ferrule deforms when the stainless steel nut is tightened and the stainless steel triangular ferrule clamps onto the tubing at the same time to increase the sealing pressure. Both stainless steel parts are reusable while the carbon PEEK ferrule must be replaced when the fitting is removed or loosened. Each kit contain all 3 parts and, as priced, come in packages of 10 complete kits or $16.50 per kit.