I'm makin a cannon its built but I'm havin trouble makeing a diaphragm for it,
the valve type is more or less a super enlarged orbit watermaster 57101 valve
http://i4.photobucket.com/albums/y132/The_Ogre/basicdiagram.jpg
here is the main style of the valve it is buit off a 4" Genvoa test T w/ a 2 ...