THE MODEL 125 CARBURETOR IS A SINGLE-DIAPHRAGM AIR VALVE CARBURETOR/MIXER. IT OFFERS A DOWN DRAFT AIR INLET THAT CAN BE USED FOR REMOTE AIR FILTRATION OR OPEN-ELEMENT TYPE AIR FILTERS. THIS UNIT IS ALSO AVAILABLE FOR LPG AND NATURAL GAS APPLICATIONS. IT HAS BEEN SUCCESSFULLY USED FOR OTHER HYDROCARBON-BASED VAPOR FUELS AS LOW AS 500 BTU. THE MODEL 125 IS ALSO AVAILABLE FOR FEEDBACK APPLICATIONS WITH THE 'FB' DESIGNATION. THESE FB MIXERS ARE AVAILABLE IN TAMPER RESISTANT CONFIGURATION, INDICATED BY THE SUFFIX :-TR" ON THE PART NUMBER. TWO SEPARATE AIR VALVE VACUUM SUPPLIES ARE AVAILABLE WITH THIS MIXER. ADDITIONAL LOW SPEED MIXTURE CONTROL CAN BE OBTAINED TO LEAN AIR-FUEL MIXTURES WITH OPTIONAL SHIMS. CHECK THE ACCESSORIES SECTION FOR MORE INFORMATION. ALL 125DG SERIES MIXERS REDUCE AIRFLOW BY 30% TECHNICAL SPECIFICATIONS FUEL.................................................NATURAL GAS AND LP-GAS AIR FLOW CAPACITY.....................235 cfm @ 2.0 in MANIGLOLD DEPRESSION HORSEPOWER RATING....................146 hp @ 2.0 in Hg MANIFOLD DEPRESSION PORT SIZE..........................................1/2 NPT MATERIALS: BODY...................................................ALUMINUM DIAPHRAGM.......................................HYDRIN DIAPHRAGM COVER......................... ALUMINUM PLEASE SEE FOLLOWING DESIGN DETAILS FOR SPECIFIC PRODUCT SPECS: ITEM IS A MODEL 125 CARBURETOR WITH MIXER (CA125M) THROTTLE BODY: AT2-23-8 SAE FLANGE: 1.25" [A] CENTER TO CENTER BOLT SPACING: 68.3 mm(2.688") [B] BORE: 36.5mm (1.438") [C] MIXER AIR HORN DIA.: 130mm (5.125") [D] OVERALL WIDTH: 140mm (5.500") [E] NPT INLET: 1/2" [F] OVERALL HEIGHT: 119mm (4.688") [G] THROTTLE BODY HEIGHT: 34.9mm (1.375") [H] THROTTLE SHAFT DIA.: 7.9mm (0.313") [I] FLANGE TO CENTER OF AIR HORN: 70.6mm (2.781") We have thousands of parts in stock, if you do not see the part you need!Feel free to ask us about conversion kits for almost anything including trucks, cars, generators, tractors, boats, motorcycles, RVs etc. We can build a kit to convert almost any engine! WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the state of California to cause cancer. www.P65Warnings.ca.gov. WARNING: These products contain a chemical known to the state of California to cause cancer and birth defects or reproductive harm. www.P65Warnings.ca.gov.