I’ve ordered/bought from MSC (Manhattan Supply Company) many times. They are a large tool and machinery seller and very reliable. Their full catalog is about 3 inches thick with machinery items. Not a risk if they have something you want/need.
I just bought a regulator from the Home Depot, it works freat and cost about $20 and came with a gauge. The only thing to avoid, so I have been told is Central Pneumatic.
i know some about regulators and water bowls…from my experience its the type of valve that comes with the complete unit…there are two types wet and dry…this meens one is a capture bowl while the other is a lubricator…capture bowls are for the need of dry air for brakes pnuematic indexers…while lubricators are filled with the proper oils for the applicationand uses include hydraulic actuators…some regulators are for air while others are for fluids.A air regulator consists of a tighter and more secure valve gate while the fluid regulator is not…think “Density”