Nov 12, 2010 #1 R rb68rr Active Member Joined May 25, 2001 Messages 1,534 How can you tell the difference just by looking? Any numbers?
Nov 13, 2010 #3 4 49-blues Active Member Joined May 30, 2001 Messages 7,628 you could probably pump up the actuator with a mityvac pump and see what pressure it opens at.