These Straight Snap-In Economy Nylon 6/6 Liquid Tight Fittings offer extra cost-savings and are UL approved for use with Liquid Tight Flexible Tubing. They are available in 4 sizes; 1/4", 3/8", 1/2", and 3/4", and provide a low-cost, one-piece solution with smooth internal surfaces for easier wire routing, protection and installation. Their all Nylon 6/6 construction is resistant to salt water, weak acids, gasoline, alcohol, oil, grease and common solvents (note: this feature is not assessed by the UL certification and testing)Optional Black and Gray. Collars also available as listed below, to neaten rough cut tubing ends. Locknuts are listed in the "Liquid Tight Locknuts" section of our catalog.