GREAT STUFF PRO Gaps & Cracks Insulating Foam fills, seals, and insulates gaps up to 3". We are very familiar with these Dow Great Stuff products so send us a mail or give us a a call if you have questions. The Great Stuff PRO line of products are the perfect solution for stopping air and moisture infiltration and thereby providing more comfort and energy efficiency in your home. Here are some of the features of the Dow Great Stuff Gap Crack foam insulation sealant. Top quality foam gun dispenser: Our foam guns are the highest quality money can buy at an affordable price. We have sold thousands of these guns and have compared them with the top brands and find ours match or exceed the performance of branded items. High quality manufacturing ensures a simple, effective foam application every time. Barbed extender tips allow for easy attachment of nozzles and straws to reach tight spots. PTFE Non-Stick coated adapter basket, dispensing needle and ball valve promote easy cleaning. Trigger fittings ensure minimum play with the dispensing needle. Smooth trigger action--far less tight than many other brands. Easy-to-use control knob allows for foam bead adjustment. Proper storage and cleaning results in several years of functionality. With GREAT STUFF PRO gun cleaner, there's no simpler way to clean your foam gun thoroughly and ensure an effective application every time. Easy care and cleanup once you've finished applying foam. Dissolves and removes uncured polyurethane foam with a unique cleaner formula specially made for Great Stuff foam.