The dual compression created by the specially designed nut and ferrule enables the SealTight Fittings system to outperform standard finger tightened fittings. The forward cone of the SealTight Ferrule provides gripping power and a leak-free seal via conventional compression by the receiving port. The slotted end creates the second compression zone in conjunction with a SealTight Nut. All SealTight Nuts are for use with 1/16” OD tubing and are designed to be used with the F-192 Ferrule.