MARATHON Power Emulsion Spray Unit for sale in Climax, NC, Power Emulsion Spray Unit Cold tack spraying units are available in 115 gallon and 180-gallon capacities and also in a portable unit when a material drum is used as the supply tank. These units all come with a 4hp Honda gas engine and 10 gpm pumping system. These units have a 10-gallon flushing tank. Spray wands with 50 ft hoses are included with all units too.