Foamnseal FNS 500&ndash;2 Pack Foam Sealant Dispensing Gun / Tool Two FNS500 gun package. Discounted Pricing. TEFLON non-stick canister adaptor, needle, check valve, gun body for easy foam removal Adjustable foam bead control allows variable foam bead size control Excellent bead control, allows variable bead size. No post-dispensing foam drip.Less foam waste. Restartable for up to 30 days Compatible with Great Stuff Pro, Touch n Seal, Fomo Handi-Foam, Handi-Stick, Seal Pro Guns