can anyone tell me the normal working pressure for the tubes on my rib, they are 1200gsm hypalon tubes fitted by henshaw. I have to ask as I took my dad out today and he asked me how much pressure are the tubes supposed to be inflated to. I was stumped! This is only my second rib, the first was a small avon 3.4m which I was too busy having fun in to really worry about things like that. This is the first year I have started to use the boat properly having just made it seaworthy after a couple of years of neglect by the previous owner. Also is there a guage or something you can buy to check the tube pressure with? Is it really that critical?