I was able to find the replacement metal top cap and bought a few for my tanks. I can't believe Tobeco used plastic! I bought the ss and the black and can use any drip tip. Actually, they have 2 versions; a 510 compatible and a one piece. I'll try to remember where I got them. I'll check how many I have if I can't find them. I probably have another 3 of each color. I won't use them all.