Hi guy I'm getting in to bottled co2 because I'm running a sealed system. there are many brass co2 regulators on eBay listed for hydroponics for about $40 out of California. They seem to be the OEM models for the CAP and Titan co2 regulators but I could be wrong. Anyone have experience with these? Are they reliable? Cause I'm not trying to kill my crop with a blown reg. Thanks!