Hello, thank you for the question. I tested this out last night and can confirm the flow regulator will totally turn off the water fully off. As by doing this it builds the pressure you just need to ensure you have the wash brush securely attached onto the connector. You can also use the flow regulator to reduce the water pressure a little and control the flow of water if needed. Regards, Hilka Tools
Answered by: Hilka Product Expert
Date published: 2020-04-20