TTC 1-wire, 2-wire, and 4-wire fittings. Designed to fit 1 wire, 2 wire, and 4 wire hoses, Aeroquip’s TTC series fittings are a 1 piece design that do not require skiving (removal of the hose cover).  Fittings fit SAE 100R1, SAE 100R2, SAE 100R4, and SAE 100R12.  Similar to Weatherhead Z series, Gates Mega Crimp, and Parker 46 series