• High-quality waterfall foam sealant. 
• Comes in a large, 20-ounce can.
• Fills in crack between rocks to ensure a smooth flow of water.
• Black coloration hides the foam so it doesn't stand out.
• Non-toxic formula, completely safe for fish.
• Specialized trigger design allows it to be used at any angle.
• Dispersal straw can be folded in for storage for two to three weeks.