These Swagelok® multi-purpose fittings allow a 3/8" ID flexible vinyl, or rubber hose to adapt to a 3/8" tubing adapter. The hose side is barbed and a hose clamp should always be used to secure the hose onto the barbed end. The 3/8" tubing adapter end uses an outward facing nut and ferrule set which then connects to a threaded male Swagelok fitting. A 3/8" nut and ferrule set is required and must be purchased separately. These industry standard Swagelok compression-type fittings and components are precision manufactured and offer a gas-tight, metal-on-metal seal. They are available in standard fractional tubing sizes for making up stainless steel tubing. Polished surface finishes and high purity materials virtually eliminate these fittings as a source of system contamination.