Just a note.
If you happen to drop the check valve into your engine compartment and try to look for it with a drop light for 45 min. with no luck and then drive to 4 auto parts stores only to find out that none of them sell this size check valve you need and drive home cursing all the way. Try putting the H2 in reverse and jamming on the brakes first. It may fall out from the engine compartment and land safely on the driveway!
