LASCO 19-5203 Compression Fitting with Integral Sleeve Nut and 1/4-Inch OD, Nylon Nylon compression fitting with integral sleeve nut Use for hot or cold water 1/4-inch od nut with integral sleeve No need to disassemble fitting - just loosen the nut, insert tubing, then tighten Use on copper, PEX, poly and aluminum tubing