CrimpTech Hose Nipples are used in fluid applications where a safe, consistent, and reliable end configuration is required. They feature an interlock groove that is designed to accomodate "interlocking crimped ferrules" for ultimate holding power (they can also be used as regular insert fittings in field and used with band clamps). The hose barbs have a graduated serration pattern for added coupling integrity (when used with crimp ferrules) and rounded end barb to reduce the potential of gouging the tube during installation. Interlocking CrimpTech fittings & ferrules are truly superior to traditional hose barbs/inserts (for fluids) on the market.