O-ring used with Brine Valve Piston Assembly 1650 PN 16924

O-ring used between the BLFC Fitting and the 1650 Brine Valve Piston Assembly ( and actually comes ON the 1650 assembly, PN 60011 ).
** If you need JUST this O-ring, 16924, here it is **
ITEM labeled # 8 in most diagrams.