Hi, I have a (like new) used BCD inflater hose I want to attach to my 1st stage. The o-ring looks perfect but I would like to have new to be safe. My question is, can I use an o-ring from the hardware store that looks to be the exact size? I understand the o-rings in the regulators themselves have to be a certain type of material but does that include the hoses? Does anyone know what type of material these would be made of? Thanks for any input.