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The ARO pneumatic pump is $230 (less brush and hoses).
It's quiet, small and one of the best upgrades I've ever done.

Thanks to Cordell Caminas for recommending this last year.

Jeff Jewitt

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Last year Cordell wrote:

I have an ARO 1/4" low flow diaphragm transfer pump.
The pump is 4.5 gallons per minute max, pump body
is polypropylene and the diaphragm is teflon.
It consumes very little air, 1cfm/1gpm.

I bought it from Graingers their part # is 4p971 and cost $230.

I've had the pump for 2 years and it works much better
than my previous gear pump. I have a 3/8 plastic tube
8' long on the suction side so I can place the pump out of the way.

The air regulator and the gages are the same ones
I use for spaying and are mounted on the wall.

Cordell Caminas
Al.