It’s $10 more because their air system and valve are much more heavy duty. The tank is meant for marine uses and can handle up to 1000psi, according to someone I talked to over the phone over at Bu-ell. Not to mention when you order the horns in bulk (like Hornblasters does) they cost less. I’d still prefer ordering them through hornblasters cause of the bigger valve. Bu-ell still gets the money while we get a slightly cheaper price and bigger valve.