The Milcarb CO2 Wing Nut Coupler is the perfect solution for filling Bulk Liquid CO2 in industrial, restaurant, and bar applications. Its spin-on design allows for easy connection and disconnection from the Milcarb Fill Nipple P/N MC-N12-8F & MC-N12-A8 while under pressure. This coupler is also featured on the Milcarb fill gun MC-PG1, providing versatility in usage. Its durable construction ensures a long-lasting, reliable connection for all your CO2 needs.