#360 Mega-Air Foam Sprayer Mega-Air Foam System is an air-operated spray dispenser. This unit can handle pre-diluted or straight product. Designed to be used with Romix’s bulk tank or tote systems for premixing concentrated or foaming RTU products. Call for pricing if a bulk purchase of BACK-SET is being considered. BACK-SET may be used to remove cured cement, concrete, mortar, grout and stucco off virtually any surface without harm. Equipment type: ready-mix trucks, mixers, vehicles, forms, molds, buggies, ship-holds, tankers, pumps, trowels, screeds, vibrators, concrete saws, slip form pavers, augers, and more.