The ProTack TW500 tack wagon features a heavy-duty 12-gpm direct-drive asphalt pump powered by a 5.5-hp Honda engine. An adjustable relief valve allows maximum control of pressure and volume, the company says. The wagon holds 500 gallons, and it has a 10-inch fill spout. A 40-foot-long, ½-inch-diameter hose allows for spraying in an 80-foot work area. List price for the basic unit is $11,340 with a parts-and-labor warranty of one year or 1,000 hours.