Adjustable regulators are generally high-pressure regulators by default. They are responsible for delivering the required pressure to the propane heater. In case of low or high pressure, such regulators can be manually adjustable to provide a comfortable pressure.
Propane gas tanks and hoses come with such adjustable regulators.
Last update on 2022-01-25 / Affiliate links / Images from Amazon Product Advertising API

I am Richard A. Jackson man behind propane heating solution, An HVAC expert working as a team lead of the heating department, Provide services all over the USA (around all major cities), and from planning to implementation, you will get all your solution here. We provide various tanks (propane and other natural gases) and deal with disposable waste.