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