Hydrostatic Pressure Test on GRUNDFOS CRN64 Vertical Multistage Booster Pump by ABET Distributing | Jan 27, 2021 | GrundfosHalfway through the hydrostatic pressure test on this unit, which serves to ensure mechanical seal integrity. Pump is a GRUNDFOS CRN64 vertical multistage booster pump. Pump to then be painted and shipped out to the end user.