hi wrote:thats how i've always done it. it would be kinda difficult if you couldnt take the cap off wouldnt it?

Alright thanks that makes sense.

hi wrote:it goes on the end of the pipe, then you screw a plug onto it to close the chamber after you put fuel in.

Ohhh, ok so its just to allow the cap to screw on?

a female adaptor refers to a threaded adaptor. there is a male one that goes on the other side of it, making your vent door. you might have a hard time finding one in that size at homedepot/lowes etc, but a plumbing store should have one. actually, any place that caries 2.5" pipe should have ...

take about 3 feet of 2.5'' pvc. then glue on a female adapter and put a bolt a little less than halfway down to stop the tennis ball. drill a hole and put in a lantern lighter, spray some propane in there, screw on and cap and let er' rip.

What is the female adapter for if you don't mind me ...

Sounds good guys, thanks for the info! keep the suggestions coming!

Alright, this is my first post so be easy on me. I want to make a second tennis ball mortar. My last one was a POS to say the least. It was made out of pringles cans and duct tape (you get the idea). I want my new one to be made out of PVC and to be gas powered (hair spray, deodorant ect.). So I ...