I have been seeing a bunch of flatlines for sael on ebay. One person wrote that the flatline that is on his 3000 psi tank can be used up to 5000 psi. I am unsure if he knows what he is talking about, I figured he saw a burst disk or something. My question is if there is a burst disk somewhere on his setup that says 5000psi, can the flatline really handles 4500 psi? Could I put the reg on my 4500 tank? Thanks.