If your tapware doesn’t have a one way valve this Standard Vacuum Breaker is compatible with most shampoo bowls and it is a one way value that prevents contaminated water from mixing with the fresh city water supply. This unit prevents perm solution, color chemicals, and neutralizers from going back into the city’s water. A vacuum breaker is required in some countries based on local plumbing codes. Please consult your plumber for local building codes.
