In the mid 1940’s Cullen Crawford developed & patented the original flareless fitting nut & two ferrule system). Based on this innovation, he founded the Crawford Fitting Company, creating a new & innovative industry for compression fittings. A leak-proof seal is made through proper ferrule action as the ferrules are tightened onto the tubing via axial thrust provided by the nut. The ferrule provides a leak-proof seal when the nut and ferrule are properly tightened the specified number of turns. Tylok fittings are manufactured in stainless steel, brass and carbon steel, and they are proudly made in the U.S.A.

CBC-Lok Tube Fittings are fully interchangeable with Swagelok & Parker A-Lok. CS-Lok Tube Fittings are fully interchangeable with Parker CPI. Although it is always recommended to use all Tylok components intermixing Tylok bodies and/or components parts with that of other manufacturers will not adversely affect sealing ability. CBC-Lok Tube Fittings are made to strict quality control standards.