I have a customer that has a Ryobi weed eater. Everything works fine but his little gas line cracked from his tank to his engie. He bought a new line but the new one didn't seal to the tank. He has tried caulk, sealant, other things to put around the little crack between the tank and the line. I didn't know if there was some sort of rubber nipple the line would stick into and then you would push the rubber nipple into the tank and it would make a tight seal. Please any ideas??? Thank you all for your time and have a great day!!!