Recommended Toilet w/ a Removable Waste Tank That Connects to a Water Line

Updated 10/30/2025 | Published 02/20/2025

Products Featured in This Question

Thetford C402C Cassette Toilet - Internal Water Supply - Electric Flush - Right Hand Access

(14)

$692.79

Thetford C223CS Cassette Toilet - Electric Flush - Swivel Seat - Integrated Back Cover

(8)

$712.24

Question:

I am adding a wet bath to an existing box trailer and deciding what type of toilet I want to use. I will be installing a water tank and was wondering if this toilet can be used with an external water tank or does it have to be used with the internal water tank?

asked by: Cody G

Expert Reply:

Hey Cody! The Thetford C402C Cassette Toilet item # TH39UE has a internal fresh water tank. Since you're wanting to use an external water supply, you'll need the Thetford C223CS Cassette Toilet item # TH62YE. This one also has a removable waste tank for your wet bath but you can hook up a water line to it.

I have linked a review video below so you can see the features and dimensions of this toilet broken down. If you have any additional questions feel free to reach out below in the comment box.

expert reply by: Jerred H

Jerred H.

10/30/2025

Hey Cody, how did things go with the Thetford C223CS toilet for your wet bath setup? It sounds like the external water hookup might have been a better fit for your build. Sharing how it worked out could help others planning a similar trailer project.