The PX-7 Mechanical Purge Gun is ideal for Slab Jacking, Roofing, Residential Foam and Coatings. Some of the features include: β’ Economically Priced β’ Mechanically Self Cleaning β’ Solvent Free β’ Airless Atomization β’ Internal Impingement β’ Machined Coupling Block β’ Precision Ground, Single Piece Valving Rod β’ Rebuildable Manual Valves β’ Stainless Steel Hardened Gun Block