Actuator question

[LYNCHSTAR]

Tested the ports on actuator with a foot pump the front one holds pressure and the back one dosent it hisses out air it's the same on several spare ones that I have is this normal if so what is the reason for the air leak on the back one.

[HULK]

I can imagine this is normal, remember if you do the cup mod no pipe is fitted on to the back port!