The Water Evolution T0.42V.BI, formerly referenced as T1.42V.BI, is the ISOBOX version of the first-fix internal body used with the compatible T1.42.E concealed wall control. It is installed inside the wall before tiling or the final wall finish is completed and forms the hidden working section of the mixer.

This version is designed for a one-outlet concealed mixer installation with a vertical outlet. The visible T1.42.E wall control is fitted separately at second fix, so the internal body should be selected and installed before the wall is closed.

What does this internal body do?
The concealed body connects to the hot and cold water supplies behind the wall and contains the internal mixing valve used by the finished wall control. Once first fix is complete, the compatible T1.42.E external control is installed over the finished wall surface to complete the mixer.

The internal body itself has no decorative finish because it remains concealed. The colour and finish visible in the finished bathroom are provided by the external Water Evolution control selected for the project.

What is different about the T0.42V.BI?
The T0.42V.BI includes the Water Evolution ISOBOX installation box around the concealed mixer body. This is the main difference between this model and the standard T0.42VI.

The ISOBOX version provides the concealed mixer body as part of a defined installation housing rather than the fixing-plate-only arrangement used on the standard body. The hydraulic function remains the same: one concealed mixer, one vertical outlet and compatibility with the T1.42.E external wall control.

Standard body or ISOBOX version?
There are two internal body options for this one-outlet vertical concealed mixer system:


T0.42VI – Standard concealed body with fixing plate. No ISOBOX installation box.
T0.42V.BI – Concealed body supplied with the ISOBOX installation box.


Both versions provide the same basic mixer function and both accept the same T1.42.E external wall control. The choice is therefore primarily about the preferred first-fix installation system rather than a difference in how the finished mixer operates.

When should I choose the T0.42V.BI?
Choose the T0.42V.BI when you want the concealed body supplied within the Water Evolution ISOBOX installation system. This is the more complete installation package of the two options and is intended for projects where the installer prefers to work with the dedicated installation box rather than the standard fixing plate arrangement.

Important installation note
This is a first-fix component and should be chosen before the wall is closed. Confirm the internal body and external control combination with your installer before installation. The Water Evolution product code determines compatibility; the visible finish of the external control does not identify the correct internal body by itself.

Key Features

First-fix concealed mixer body with ISOBOX
Current reference T0.42V.BI
Former reference T1.42V.BI
ISOBOX installation box included
Designed for one-outlet concealed mixer installations
Vertical outlet configuration
Compatible with T1.42.E external wall control
Internal / concealed wall installation
Single lever mixer body
Brass construction
One outlet
One installation hole
Flow rate 20 L/min at 3 bar
ANQIP certified
Designed by Studio WE
External wall control sold separately unless included as part of a complete set


Product Info
Brand: Water Evolution

Collection: Flow

Product Type: Concealed Mixer Internal Body

Current Product Code: T0.42V.BI

Former Product Code: T1.42V.BI

Version: Body with ISOBOX Installation Box

Compatible External Control: T1.42.E

Outlet Configuration: 1 Vertical Outlet

Installation: Internal / Concealed

Mounting: Wall Mounted

Material: Brass

Lever Type: Single Lever Mixer

Installation Holes: 1

Flow Rate: 20 L/min at 3 Bar

Certification: ANQIP