Submersible Sewage Pumps

50mm Submersible Sewage Pumps with GAK-50 Coupling

Name: 50mm Submersible Sewage Pumps with GAK-50 Coupling
Brand: Haquan
SKU: WQ/QW

Model: WQ/QW

50mm WQ/QW submersible sewage pumps with factory GAK-50 auto-coupling. Fixed installation for small lift stations without pit entry.

Specifications

Flow Rate	10-20m³/h
Head	7-15m
Power	0.75-1.5kW
Inlet / Outlet Diameter	DN50
Material	Cast Iron, SS304, SS316L

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Product Overview

The 50mm size is where GAK auto-coupling becomes available from the factory, which changes the maintenance conversation entirely: instead of pulling the whole pump out by hand, it seats and seals by gravity on guide rails, and comes back up the same way. Nobody has to step into the pit.

Model	Flow (m³/h)	Head (m)	Power (kW)	Type
WQ-50-20-7	20	7	0.75	Higher flow, lower head
QW-50-10-10	10	10	0.75	Lower flow, more lift
WQ-50-20-15	20	15	1.5	Industrial sump duty
WQ-G-50-10-10	10	10	0.75	Grinder variant, cutting blades ahead of impeller

The WQ-50 and QW-50 at the same power class exist because flow and head don’t scale together — pick based on whether your site needs to move more volume or lift it further, not on price alone. The guide rails and lifting chain are ordered separately from the pump itself, sized to your actual pit depth; that catches a fair number of first-time buyers who assume it’s bundled.