This is a brass adapter that fits all O.S. car slide carburettors when you want to use a separate/remote R/C needle. That is perfect for marine applications where you want to control the main fuel inlet from the radio when rac

Features:

• Fits all O.S. 3.5cc car slide carbs, such as 21M4, 21J4 & 22E etc.
• May fit other 3.5cc carbs also if they have a M5x0.5mm threaded main needle

Notes:

• The O.S. Nipple no.15 is sold separately (#OS22082950)
• If you have a O.S. slide carb already, use the nipple and washers from that