Fittings DK-Lok brings you excellent quality Outstanding customer service. and availability Enjoy Dk-Lok tube fitting working your application ! Hose Adapter Fittings DK-Lok Hose Adapter Fittings are designed for use with soft plastic or rubber tubing. CatalogSpec. Stainless Steel and Brass 1/8 to 1 in. Hoses Male Adapter, Female Adapter Tube Adapter DK-Lok Tube Fitting Adapter Hose SleeveBrief Description DK-Lok Hose Adapter Fittings are designed for use with soft plastic or rubber tubing. Standard hose barb design is for use with hose sleeve or hose clamp. DK-Lok hose adapter fittings are reusable Stainless steel and brass construction.