As a solid and sturdy material, brass is perfect for hose systems as it can withstand long periods of wear and tear High quality and deep threads allow the fittings to bite better, not easy to slip This pipe fitting can apply to water, air, gas, oil and fuel. Barbed fitting for a tight seal on hoses and NPT threads for a tighter seal than straight threads These fittings contain lead and are not allowed by federal law to be installed for potable water use in the U.S.A. and its territories