This super XL 2.5 liter enema bag kit offers a lot for the money.
The set comes with:
5 feet of 1/2 inch non-kinking clear plastic tubing.
Slide clamp for flow control.
A cuff inflator which is designed to comfortably inflate nozzle tip so it can not be pushed out by the enema receiver.
An optional blue bulb (at an additional cost) for introduction of air into the colon.
The blue colon bulb is not needed for a good cleansing. Inducing air into the colon is believed to help speed up cleaning process and can cause cramping. Nozzle is 3/4 inch wide.