Toilet fixtures usually connect to water supply valves with flexible steel hoses. Butt if you have a hard pipe instead you'll need replace the pipe between your toilet and water supply with a flexible hose before installing your DUDE Wiper 1000.
Sizing Up Your New Flexible Hose
The top connection size should be 7/8" ballcock to connect to the T-Valve that you will install under the toliet tank. The bottom connection (to the water supply) will vary (most common are 3/8" & 1/2" female compression) The length of the hose will also vary based on your toilet. So take a measure before of your existing hard pipe & don't buy a flexible hose longer than that.
Fluidmaster is a brand we recommend, but your local hardware store will have a variety.