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Install the Mainsboost Monobloc between the stopcock and the rest of the system using the compression fittings and 

adaptors supplied. Refer to the chart below as a guide.

Note: 

Do not

 forget if a water softener is to be installed this has to be included in this pipe run, and additional space 

must be allocated for this.

Do not

 fit smaller pipework than the Mainsboost Monobloc accepts as this will impair performance.

Do not

 fit the Mainsboost Monobloc upside down. Only fit in the orientations shown in figure 2.

Ensure the Monobloc and connecting pipework are adequately supported via the use of suitable pipe clips.

MAINSBOOST

Installation, Operation & Maintenance Instructions

MAINSBOOST MONOBLOC 22MM/28MM C/W GAUGES

MAINSBOOST MONOBLOC 22MM/28MM ULK VARIANTS

PRODUCT DESCRIPTION

Mainsboost Monobloc 22mm/28mm c/w gauges ensures mains fed systems comply with water regulations, it will ensure 

backflow prevention and regulate the pressure from the mains to a system.

CHECKLIST

* Items 3 and 4 are only supplied with ULK variants.

Your product may vary slightly from the illustration above.

INSTALLATION

Step 1:

Pipe 

Size

Minimum pipe length required to install the 

Mainsboost Monobloc

22 mm

203 mm

28 mm

203 mm

Fig. 2 Minimum pipe length

203 mm

203 mm

Fig. 1 Monobloc 22/28mm

1

5

2

3

Item Description

Qty

1

Monobloc unit

1

2

¼ “ BSP Pressure gauge

2

3

Lever isolating ball valve*

1

4

Mainsboost vessel connector 

fitting*

1

5

22/28mm compression adaptor

2

4

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