as far as I know they are no longer being made.I have 2 for glow and they come with a special pressure tap for the backplate.on the four hose setup 2 go to the tank one to the presure fitting on the backplate one goes to the spraybar.If you are using gas you should not need these as most of the gas engines using a walbro type carb already have a pump as part of the carb.I do not know if they could be used for glow as you would need the pressure adapter and and I do not know if the pulse from a glow engine is strong enough to operate the diaphram of a gas pump