Our Dust Cap is the perfect accessory for protecting your Milcarb Fill Nipple from the harsh outdoor elements. With its retaining chain, it securely covers the CO2 Fill Nipple threads, ensuring that no foreign matter enters the inlet and adding longevity to the life of your MILCARB Wing Nut Coupler. Please note that the fill nipple is not included with this product. Invest in our Dust Cap today and ensure optimal performance and protection for your gas distribution system.