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
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"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