A sprinkler system employing automatic sprinklers attached to a piping system containing air or nitrogen under pressure, the release of which (from the open sprinklers) permits the water pressure to ...

The ball valve trigger has since been replaced with a valve from a sprinkler system, giving this high power PVC air cannon a fancy brass trigger. It looks awesome, and can kill a watermelon from ...

Blowing out sprinklers involves draining all of the water out of the system. It's a pretty important process to do before the ...