The Oil Analysis Company | Home Page | Oil Sample Kits | Weber Carb Parts | Chemicals | Porsche Posters | Contact Us | FAQs | Shopping Cart | Links Page | Links Page 1 | Carb Tuning | Security & Company Info 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: • 3 Barrel Linkage Kits • 3.6 Intake Manifolds • 911 Intake Manifolds • Acc Pump Body Cover • Accel. Pump Spring • Accelerator Pump Diahragm • Air Adj. Screw • Banjo Bolts • Banjo Bolt Washer • Banjo Gasket • Carb Base Gaskets (6) • Cup Washers • Emulsion Tubes • Inlet Discharge Valve • Float Level Gauges • Floats • Fuel Bars with AN Ftg • Fuel Bars with Hose Barb • 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 • Pump Body • Pump Studs • Rebuild Kits - 2 barrel • Rebuild Kits - 3 Barrel • Secondary Venturi's • Shaft Bushing • Spacer Kit • Synchrometer • Velocity Stacks • Venturis - Main • Top Cover Gasket