Anderson Metals Tube Fitting, Delrin Sleeve, 1/2" Tube OD (Pack of 3) Sleeve for a compression tube fitting Connects to copper, brass, aluminum, or plastic tubing Delrin (acetal copolymer) for low moisture absorption, high tensile and flexural strength Operating temperature range of -65 to +250 degrees F No flaring tool required for assembly 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.