The Oil Analysis Company | Weber Jet Suggestions | Home Page | Weber Carb Parts | Contact Us | Shopping Cart | FAQs | Links Page | Links Page 1 | Security & Company Info | Carb Tuning | PMO Carburetors O-Ring This O Ring should be placed on the Idle Mixturing Adjusting Screw with a Special Cup Washer (also available here) used to keep the O-Ring in place.  These O-Rings and the special washers can make a huge difference in the way your Porsche runs!  Without the washers and o-rings the engine will back-fire, spit and sputter except when accelerating (which is usually very smooth).  The O-Rings are Item # 43 on most Weber 40-IDA parts diagrams. $0.25 Related Items Here are some products that may also be of interest to you: • Linkage Kits • Intake Manifolds for 3.6L • 911 Intake Manifolds • Acc Pump Cover • Accel. Pump Spring - Large • Accelerator Pump Diaphram • Air Adjusting Screw • Banjo Bolts • Banjo Bolt Washer • Banjo Gasket • Carb Base Gaskets (6) • Cup Washers • Emulsion Tubes • Inlet Discharge Valve • Float Level Gauges • Floats - Hard Foam or Metal • Fuel Bars • Fuel Filters • Fuel Pump • Idle Adjusting Screw • Idle Jet Holder • Idle Mixture Adjusting Screw • Jets • K&N Vapor Kit • K&N Watershields • Main Jet Carriers • Manifold Gaskets - 12 pack • Needle Valve • O-Ring • Plug, Needle Valve • Pressure Control Kits • Accel Pump Body • Pump Studs • Rebuild Kits - 2 barrel • Rebuild Kits - 3 Barrel • Secondary Venturi's • Shaft Bushing • Insulator Kit • Synchrometer • Air Horns (Velocity Stacks) • Venturi Set • Top Cover Gasket