The tub will have 3 port holes exactly centered on the wall for a 4" or 8" on center faucet. If you use a 8" on center faucet, the faucet will be exactly centered because you will be using the outer 2 port holes. If you use a 4" on center faucet, you will be using the 2 right or left port holes which will make the faucet not centered. It comes with a stainless still plug that matches the tub stainless so you can plug the port hole that is not being used.
If you order a Groomers Best Faucet Plumbing Kit, the tub will have 4" on center water ports.
How do I choose where I want my water ports and drain?
Imagine yourself standing, facing the front of the tub. Your right hand will be on the right side of the tub and your left hand will be on the left side of the tub. This is how you choose the water ports and drain location to your needs. You do same same to choose your ramp location.
Drain and water ports not advisable to be on same side as ramp as the dog may step into the drain cavity.
Center back wall water ports not advisable on center back wall for wheelchair use as the person bathing will not be able to reach the faucet.