A little off topic from bikes, but involves a bike related accessory. I have two floor pumps at home, one works and the other was given to me after my dad lost a piece (kept it in case I broke a part on my pump). I am going to try to launch some water bottle rockets with my pump, but I am a little nervous about standing too close when the bottles pop off. I thought about unscrewing the hoses and combining them together to make a longer, safer hose for this project. Not sure what connector would work in this case. Anyone ever tried coupling two lines together?