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1.This polyurethane foam gun set includes one heavy duty reusable spray foam insulation gun, three long metal foam extension nozzles and a dedicated foam gun cleaning brush. Extended foam spray 1.tubes access hidden narrow deep gaps unreachable by standard short nozzles, fulfilling deep crack filling needs without separate purchase of replacement foam gun nozzles. It is a practical long reach foam gun accessory set for DIY enthusiasts and professional contractor construction work. 2.The expanding foam dispensing caulk gun features full PTFE non-stick coating on gun body and extension tubes, a practical upgrade to lower frequent clogging during long-time use. Cured foam residue can be peeled off easily without harsh solvent cleaners, effectively cutting tool replacement costs and extending the service life of your foam insulation gun for long-term home renovation projects. 3.A rear adjustable flow control knob allows free customization of foam output volume to avoid excess expanding foam overflow and waste. Humanized pistol grip and smooth pull trigger ease wrist fatigue during hours of gap sealing work, making this adjustable flow foam gun a practical helper for daily heavy-duty construction and DIY handyman repair tasks. 4.The top red pressure relief lock instantly cuts internal tank air pressure when pausing work, greatly lowering foam dripping and messy overflow on walls, windows and cabinets. Standard threaded connector fits most mainstream threaded polyurethane foam cans on the market, this pressure relief foam gun matches common expanding foam insulation bottles without extra adapters. 5.This functional foam filler gun for cracks works well for window door frame insulation gap filling, wall crack repair, cabinet interlayer void sealing, ceiling gap blocking, pipe through-wall hole filling and cold storage insulation. The long reach foam gun fits professional contractors, maintenance staff and DIY homeowners for all indoor and outdoor renovation gap sealing jobs.