should I leave the black plastic switch thing or take it out? or does it matter?

I like pneumatics better, but I plan on building a new combustion one for portablitlity. I need an air compressor to fill my pneumatic, and I can't haul that wherever I go. But with a Combustion all I need is the gun and some hairspray.

I was leaning toward the more liquidy epoxy, but ok. I'll think about the putty.

This is to fill in holes in my sprinkler valve b/c I got tired of having the solenoid in the way. Should use liquid epoxy for plastics or should I use epoxy putty?

where I live, not home depot like store carries anything over 2". I went to as place called ryan herco and harrington's industrial plastics. check their homepages for store locations.

sorry, it's just a plain sprinnler valve actuated with a blow gun. I think it is just because I have so much air in the chamber left over after I shhot my projectile.

Just the other day I shot a potato about 300 feet using a 2 inch barrel @85 psi. GGDT says that can go 555 feet max. My one inch ...

...and I don't know what to use. I currently have a blowgun and it honks like crazy. I have a big air chamber (5 feet of 4" pvc) and after I fire, I can come back and trigger the blowgun to get a loud honk. Then after a several seconds, I can honk it again...reading from the wiki, I need a bigger ...