Weber service kit to suit IDF Weber Carburettor. Genuine Weber replacement parts Please choose option of carburettor size, needle valve size, and pump diaphragm type. Carburettor size - 40, 44, 48 Needle valve size - 175, 200 Pump diaphragm (early - spring loaded centre, late - solid centre) Early Style - to suit early carburettors where the pump is activated by a cam and roller (normally pre 1980) Late Style - to suit later carburettors where the pump is activated by a threaded rod and nut