246-307-666 VIPER Knob Control 3.5" Service. Knob has threaded insert with set screw.

246-433-000 VIPER Knob Valve (Double D Stem) For valves with stems that have flats on both sides.

Viper Quick Connect Coupler (2 Pack) connects hoses on Viper antifreeze flush and fill units.

5066 Viper 3 Piece Replacement Quick Connect Insert Kit (2) Female (1) Male. Connects hoses on Viper antifreeze flush and fill units. Replaces part numbers, 253-315-100, 253-315-666, 253-314-100, 253-314-666.