Reg connection to tank problem?
Hey everyone, so I have 2 pure energy tanks, 1 was made in 2000 and the other 2007. The regs I had on them were shot so I bought 2 myth regs to replace them. Now when I put the myth reg on the 2007 tank it went on fine with no problems, but when I tried to screw the same reg onto the 2000 tank it only screws on about 3/4 the way on before it has a lot of resistance. I know I'm not supposed to force the threads through because I don't want to strip it but does anyone have an idea why? The tanks are almost identical, the only difference is that the 2007 tank has a longer bottle neck, about an inch long, and the 2000 has a shorter bottle neck about 1/2 inch. The old reg screws on fine but it's threads are also shorter then the new regs threads. Any help would be awesome. Thanks!!!!