I called this place looking for a new hpop, but before i ordered it i asked several questions about the check valves in the output lines, well being that oem ford replacement lines cost a fortune, i opted for a aftermarket version, i explained this to Chris, total dbag by the way, he said it would be fine to remove the anti flow valves wouldn't hurt a thing, the aftermarket fittings on my high pressure lines are more like hydraulic fittings rather then the snap together oem, so long story short i got the pump, and in the packaging it says, if your old pump is missing those, your core is no good, really, thanks for all the crap, don't buy *** from these guys, go ahead and spend the extra 2-300 bucks and get a terminator or an adrenaline after all was said and done i could've had one.