Translation of pump

This definitely doesn’t mean SB

SB pump = Submersible booster pump, a type of underwater booster pump. http://www.grundfos.com/products/find-product/sb-and-sba.html The SB and SBA pumps are submersible booster pumps designed for pumping clean water. They are particularly suitable for use in rainwater collection systems and private wells. These pumps are available in two versions: SB. The Grundfos SB is a submersible pump intended for pumping clean water; it is designed for domestic use. This pump is very quiet, and when installed underground in a rainwater collection tank or well, noise is not an issue at all. The SB pump requires an external controller, such as the Pressure Manager, in order to operate automatically. Features and advantages: Simple selection – pump plus controller; complete control and monitoring; easily accessible controller for maintenance and replacement. SBA. The new Grundfos SBA is a complete, all-in-one unit. It is based on the proven SB platform, but it comes with an integrated control unit, eliminating the need for an external pump controller. The SBA is essentially a ready-to-use solution – once installed and connected to the piping, all that’s needed is to turn on the pump. Features and advantages: Simple selection – just one unit; easy installation – also just one unit; flexible installation – no controller required inside the house

It should refer to a stuffing box