Cullen Crawford founded the Crawford Fitting Company in the 1940s and invented the original flareless fitting, creating a new industry for making tubing connections easier. He later founded Tylok International and improved upon his original design by developing the Tylok Standard 4 Seal Tube Fitting. Tylok International continues Mr. Crawford's legacy by manufacturing unique fitting lines at their Euclid, Ohio facility that eliminate common installation problems and provide superior sealing performance.