The Propane Natural Gas Snorkel for Generator by Spencer-3D is a tri-fuel snorkel designed for home backup and generator applications. Made of durable PETG plastic in a blue color, this snorkel includes a mount for easy installation. It is compatible with  zenith Wisconsin small engine carburetor or any 48mm bolt distance center to center bolt snorkel models and is manufactured in the United States. This product provides a reliable power source for outdoor power equipment using propane natural gas and gasoline as fuel types, making it a convenient and efficient solution for outdoor living.

Fits most 48mm bolt systems. Basically 48mm from center of hole to center of other hole. Was made for a customer for a  zenith Wisconsin small engine carburetor with 48mm bolt distance. I make these per order. I HAVE ANOTHER VERSION FOR 43MM DISTANCE HOLE TO HOLE CENTER I MADE FOR M6 GENERATOR WHICH IS A 7.5 HP MOTOR. ITS LISTED AS WELL. But I can make custom sizes if you can send measurements and how you need the valve to set as far as valve angle. 

I CAN AMKE THESE CUSTOM WITH INFO AND MEASUREMENTS TO FIT YOUR SET UP. THANKS... MATT OF SPENCER-3D