REMANUFACTURED GENUINE HOLLEY CARBURETTOR. COMPLETELY REMANUFACTURED HOLLEY 550 CFM CARBURETTOR SUITABLE FOR MARINE USE, FITTED WITH “J” TUBES THE CARBURETTOR IS A SQUARE BORE PATTERN WITH VACUUM SECONDARY. ADJUSTABLE NEEDLE & SEAT DESIGN (NO LEAKS). CALIBRATED FOR EXCELLENT MARINE PERFORMANCE.