Easy to make..works like a grav...get an outdoor garden hose attachment..the one that goes onto the pipe...its Y-shaped..has two valves.....when you take gravs you can open on valve to let in smoke..then close both valves..push the bottle into the water and then open up the valve....allows for a much more intense hit, getting you much higher....me and my buddies call it a super grav...try it out..youll like it
jmudmbphan Reviewed by jmudmbphan on . Make this, youll thank me later Easy to make..works like a grav...get an outdoor garden hose attachment..the one that goes onto the pipe...its Y-shaped..has two valves.....when you take gravs you can open on valve to let in smoke..then close both valves..push the bottle into the water and then open up the valve....allows for a much more intense hit, getting you much higher....me and my buddies call it a super grav...try it out..youll like it Rating: 5