This package of (5) drinking nozzles are ready to connect directly to your water cow drinking unit. It is designed to be connected to a 3/8 inch water line which is standard across MOST water cow drinking units. Be sure if you’re cutting a new line or using an existing water line that the end being connected is cut flat at a 90 degree. Any uneven cuts could result in leaks. Should you need a connection for a different sized water line, please contact me and I will see if I’m able to provide you with what you require.