Prevents return fuel flow during normal operation but provides by-pass fuel feed in an emergency if the fuel pump fails. Wt. 1 oz., 2-7/8" long. Use with tube fittings for 3/8" dia. fuel line. Anodized for corrosion resistance.

Does this ACS free flow one-way check valve use -6 AN flare fittings?
Yes, it uses 3/8" tube fittings, which is a -6 AN flare.

What is the mechanism inside the ACS free flow one-way check valve?
Per ACS Products, it is a gravity flow piston. It only allows fuel flow in one direction.

Can this ACS Free Flow One-Way Check Valve be used in any position?
Yes. This is for a free floating application, but can be mounted in any position.

What is the maximum flow rate for this ACS check valve part# 10630?
0 PSI for breakout; 20 PSI max.

Is there a pressure rating on this item? And what are the seals made of?
0 PSI for breakout; 20 PSI max. Seal are made of viton rubber.

What is the interior flapper material (PTFE?)? Is this component rated for fuels containing ethanol?
The piston is made of Delrin and there is no rating for ethanol.