When purchasing a water pump, which parts are randomly recommended to buy as backups?

As a well-known large-scale pump manufacturer in Chinese mainland, 

ATACH Pump Industry suggests that customers purchasing centrifugal pumps/pipeline pumps/self-priming pumps and chemical pumps come with some spare parts as a random component to avoid any impact on usage due to logistics and order cycle issues when replacement is needed.

1.For general clean water pumps that do not operate 24 hours a day, it is recommended to prepare mechanical seals, pump bearings, and motor bearings. 

The specific quantity should be determined based on the daily working hours.

2. For chemical pumps transporting corrosive substances, abrasive particles, etc., especially those that need to operate 24 hours a day, we strongly recommend setting up spare pumps with external mechanical seals, pump bearings, motor bearings, pump impellers, and pump shafts.

It is recommended to wear the pump casing in strong corrosion conditions. The specific quantity depends on the working hours each year.

Meanwhile, ATACH Pump Industry provides pump parts of other international brands (it is necessary to verify with the sales department whether the pump parts are compatible).