8 inch pvc pipe, a 5 gallon plastic gas can is cheaper
$15.00 +/- 12 volt air compressor
hose barb for compressor
metal or plastic "T" for right and left foam lines [I used 3/4 but I think that 1/2 or maybe even 3/8 might be better]
off/on toggle switch, wire

this works great and it will save you plenty of dollars by not over spraying high dollar chemicals
"Don't piss down my back and tell me its rain", Fletcher, Outlaw Josey Wales

Living somewhere between this world and the other, Legends of the Fall