Bravo BR-B90 Compact Low Pressure Regulator, designed for use with LPG gas cylinders.
Here's some information about this product:
It's a compact low-pressure regulator with a pressure gauge to monitor the remaining gas in the cylinder.
It's designed to reduce high gas pressure from the cylinder to a safe, lower service pressure for appliances.
The regulator may include a flow limiter for enhanced safety, automatically cutting off gas flow in case of a rupture or disconnection.