Hyundai 1 inch Owner's Manual page 20

The hose diameter should be no wider than the water suction port diameter.
Minimum hose diameters should be as follows:
1" Water Pump: 25mm
1.5" Water Pump: 40mm
2" Water Pump: 50mm
3" Water Pump: 80mm
4" Water Pump: 100mm
Use the hose clamp to securely fasten the hose connector to the suction in
order to prevent air and water leakage. Before using the connector sealing
washer ensure that it is in good condition.
Install the strainer (provided with the pump) on the end of the suction hose
and secure it with a hose clamp. The strainer will help prevent the pump from
becoming clogged or damaged by debris.
4) Discharge Hose Installation
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