1/4" NPTF Male X 3/8" Hose ID X 5/8" Hose OD. This two-piece adapter has a male NPTF threaded end and a female barbed hose end to connect hose or fittings of different types. This reusable adapter has a barbed end to connect hose to a fitting using the removable threaded sleeve, and the other end has female National Pipe Taper Fine (NPTF) threads to connect to a male NPTF connection for a tighter seal than straight threads. 150 PSI maximum working pressure. -40° to 160° temperature rating. Not deemed lead free. Not for use with potable water. Please Note: NPT Thread size is NOT determined by its outside thread diameter in inches. Please review our attached NPT sizing chart to cross reference NPT thread size to linear inches