Catalogue creation
My favorites
Product comparison
DrainLift WS 40-50 | Wilo
Your advantages
Wilo-DrainLift WS 40/50

Your advantages

  • Pressure-tight chamber for subterranean and aboveground installation
  • Flexible due to freely selectable inlets
  • Large tank volume
  • Surface coupling made of corrosion-resistant PUR
Series description


Plastic chamber with pipework, for connecting one or two pumps. Suitable for ground installation or building installation.


  • As a lifting unit within buildings (above ground installation).
  • As a pump chamber outside buildings (concealed floor installation).
  • For backflow resistant drainage of
    • Drainage points below the backflow level
    • Drainage points that cannot be drained via the natural downward slope.


  • Gate valve
  • Surface coupling with integrated non-return valve



DrainLift WS 40E


Product family


Pump chamber




Chamber design:

  • E = Single-pump system
  • D = Double-pump system

Technical data

  • Vessel volume: 255 l/67 (WS...E)/400 l/105 (WS...D)
  • Maximum pressure in the discharge pipeline: 1.5 bar (22 psi)
  • Discharge port: R 1½ (WS 40), R 2 (WS 50)
  • Inlet connection: DN 100/150/200
  • Ventilation connection: 75 mm (3 in)
  • Fluid temperature: 3 ... +40 °C (37 ... 104 °F)
  • Ambient temperature max.: 3 ... 40 °C (37 ... 104 °F)


  • Pump chamber: PE
  • Pipework: 1.4404 (AISI 316L)
  • Stopcock: Red brass
  • Non-return valve: PUR



Pump chamber with optimised geometry for deposit-free operation. Chamber component with finning for high inherent stability and anti-buoyancy. The inlets are freely configurable. Two lifting eyes are integrated for attaching the lifting accessory. The upward curved pump chamber cover can be walked on and can be loaded with max. 200 kg. For the building installation, the pump chamber is equipped with a floor fixation.


  • Discharge pipe with flange connection on the pump side
  • Gate valve
  • Surface coupling
  • Non-return ball valve (integrated in the surface coupling)

Scope of delivery

  • Plastic chamber with installed pipework
    • Pipework with gate valve and surface coupling with integrated non-return valve
  • Chamber cover with gasket
  • HT double socket 50 mm (2 in) for drain connection
  • Inlet set with hole saw 124 mm (5 in) and gasket DN 100
  • Floor fixation
  • Installation and operating instructions


  • The pump chamber for two pumps has separate pipework for each pump. They therefore also have two discharge ports. Provide the Y-piece on-site.
  • The maximum ground water level above the bottom edge of the chamber is 500 mm.

Installation and operating instructions

Wilo-DrainLift WS 40/50

Article Number 6087339
Edition 06
Page format 209.9 x 297.0 mm
Number of pages 36
PDF (6 MB)

Installation and operating instructions (digital)

DrainLift WS 40/50

Article Number 6087339
Edition 2023-07

Certification booklet

Wilo-Drainlift WS 40/50, Wilo-DrainLift WS 40/50 Basic

Article Number 6069562
Edition 2021-07
Page format 209.9 x 297.0 mm
Number of pages 72
PDF (4 MB)

Product selection
Number of results: 4