Heyco® Liquid Tight Cordgrips LabKit #8 (Part #3297) Features Use Heyco LabKits! Heyco LabKits are perfect for product design departments, experimental labs, and for all prototype work. Heyco Kits contain an assortment of our most popular Liquid Tight Cordgrips Heyco also offers lab kits for Strain Relief Bushings, Hole Plugs, Bushings, Power Components, Wire Positioning and Grommets.