Originally Posted By: sunfire
Jim Allen said:My experience is that Purolator's leaf spring bypass valve are so stiff that they don't even open. I bet you can even open the valve by pushing down on it with your finger.
I can make this style of bypass valve open by pushing (hard) with my finger. Remember that most of the PureONEs have the bypass set to 14 ~ 16 psi. If that bypass valve is ~1" in dia, then that means it would take ~11 lbs of force to make it open.