breathing system

I finished the pool portion of my SSI Open Diver certification yesterday. I had the less-expensive rental regulator and less fancy BC. I don't know the brands. The reg looked plasticky. I labored to breathe all day. The instructor said he wanted us to be used to both a better regulator...

I'm selling an entire Brownie Third Lung system with the motor, compressor, case, inflatable holder, lots of hoses & connectors & regulators. Everything must go. Very little use. I'm selling this on behalf of the elderly parents who lost their child who owned this. He passed due to disease &...