Material and part compatibility — cast-iron vs stainless steel vs brass, depending on pump type and water/chemical exposure.
Quality / manufacturing standard — some manufacturers (like G.S. Industries) have ISO-certification, CNC/foundry facilities, better inspection and quality control.
Availability and variety — whether they stock small parts (flanges, hose nipples, valves) as well as major parts (impellers, pump bodies, shafts).
Application type — domestic water pumps, agricultural borewell pumps, industrial pumps etc.; some suppliers specialize in submersible pumps, others in centrifugal or turbine pumps.
Order size and price — for small parts, price per piece or kg; for big parts or custom castings, may need to check MOQ (minimum order quantity) and lead time.
