These kits come with either a 3/16, a 1/4 inch or a 5/16 inch outside diameter tail piece barb plus the hex nut and washer that are needed to install it.
Please note: The shop will be closed on Saturday the 18-Oct-25. I will be open the evenings of the 15th, 16th, and 17th from 6-9 for anyone wanting to pickup an order before the weekend, just place your order as normal and email me to let me know when you'd like to stop by.