Installing the pump chamber extension when using the A15 and B125 pump chamber covers

To make up for the height difference between the top edge of the pump chamber and the surface level:

Install a plastic pump chamber extension, or
Use concrete adjusting rings.

1	Pump chamber
2	Pump chamber extension
3	Surface level
4	Groove for O-ring
5	O-ring
6	Pump chamber cover

Pump chamber extension installation

Plastic pump chamber extension

Plastic pump chamber extension can be used to extend the pump chamber by 200 ... 500 mm. The pump chamber extension is made of PE material and can only be ordered as an accessory. The pump chamber extension has grooves, as shown in the table:

Groove	Extension in mm (from top edge of pump chamber to top edge of extension)
3	200
4	250
5	300
6	350
7	400
8	450
9	500

Determine the required extension. NOTICE! Consider the height of the pump chamber cover.
The required dimension is specified by the selected groove at the taper of the extension. Use the applicable groove. NOTICE! Do not use grooves 1, 2 and 10.
Put the O-ring supplied into the selected groove in the extension.
Apply lubricant to the O-ring and the inner side of the taper on the pump chamber. Use washing-up liquid or even water if lubricant is not available.
Slide the pump chamber extension into the pump chamber until the O-ring wedges securely in the cone in the taper. CAUTION! Do not push the O-ring out of the cone. Make sure that the O-ring slides smoothly into the taper, is not twisted, and is not pushed out of the groove. If necessary, push the O-ring by hand when fitting the extension.

Concrete adjusting rings

1	Cover flange
2	Filling (sand or mortar)
3	Concrete adjusting rings
4	Pump chamber cover with frame
5	Filling/compacting layer
6	Surface level substructure

Concrete adjusting rings installation

To make up for the height to the surface level, standard concrete adjusting rings can be used. Height can be added up to max. 200 mm above the top edge of the pump chamber including the pump chamber cover height. The concrete rings must be provided by the customer.

Put the concrete ring centrally on the cover flange.
Fill the gap between the concrete ring and the cover flange with sand or mortar.
Put more concrete rings centrally.
To make a solid and full-faced contact between the concrete rings and the cover frame, and to prevent water ingress from ground water or surface water, it is necessary to apply a small layer of mortar to the mating surfaces on the concrete rings and the cover frame.