The Hardcast Mobile Mastic Duct Sealant Sprayer System is a revolutionary new duct sealant sprayer system. This sprayer system is actually designed to allow the contractor the ability to spray the sealant on the duct work at the job-site for the first time! This system includes a mobile pump unit, high pressure hose, sealant spray gun with swivel attachment, spray gun tips and 6 five gallon pails of SpraySeal duct sealant.