I have never found an electric cock pump that makes strong enough suction I prefer the manual pump I can make it hurt but ohh it stretches it so long and hard, the little pain is soon overwhelmed with Pleasure. I sometimes take a viagara and then pump it as hard as I can.. I have left it fully pumped for up to 3 hours ohhh it stays long and hard for at least a half hour ...I can go from 6" hard to almost 9" hard when pumped and my cock fills the tube.. I use lube so my cock stretches easier. Sean Carey sissy CD/Shemale cock whore seanette55 protonmail com Buffalo/Tonawanda, NY 14150 I have a pump up expanding butt plug I use ohh when it is fully pumped it feels soo good. Try IT