No, we’re shipping you the complete kit. Besides the floating valve, the package includes an adjustable arm for you to dial in the desired water level. Plus you get a 1/4″ fitting that you can use to attach to your supply tube. The parcel also features a 1/2″ NPT (aka National Pipe Thread) male connection with a standard washer, so it eliminates leaks.
Please do not overtighten it. Although the valve is made of premium PVC, the excess pressure may cause the material to crack.