The only difference between our unbranded SPG "brass & glass" models and similar branded SPG models is the logo and price; any SPG will work on any regulator regardless of brand and they are all manufactured by Termo Industra of Italy with equal quality construction. Our unbranded generic SPG models have a lower retail price as a result of being sourced directly from the manufacturer. Our long experience with the unbranded and branded "brass & glass" SPG models has been they all have similar reliability and durability in the field. Regardless of brand, every product we sell is backed by Dive Gear Express 5-star quality customer service. For more information see our TekTips titled SPG Depth Ratings and Inside Submersible Pressure Gauges.