The PA 550 sealcaot application unit has 550-gal. capacity and the patented Pulsair Agitation System. The Polusair system eliminates the hydraulics allowing one system to do the agitation and sealcoat spraying. Features of the PA 550 include a 1 1/2-in. Graco air diaphragm material pump; a 30-gal., 11-hp Honda Rol-Air Compressor; and a 100-ft. hose reel with 3/4-in. hose and spray wand. The Pulsair also allows for complete remixing of sealer even after the material was allowed to set for weeks.