Honda WB20XT Owner's Manual page 12

2. Connect the discharge hose.
Use a commercially available hose, hose connector, and hose band. A
short, large-diameter hose is most efficient. Long or small-diameter
hose increases fluid friction and reduces pump output.
Tighten the hose band securely to prevent the hose from
disconnecting under high pressure.
3. Check the engine oil level.
Engine oil is a major factor affecting engine performance and
service life. Nondetergent or vegetable oils are not recommended.
Check the oil level with the pump on a level surface and the engine
stopped.
Use high-detergent, premium quality 4-stroke engine oil, certified to
meet or exceed U.S. automobile manufacturer's requirements for API
service category SE or later (or equivalent).
Select the appropriate viscosity for the average temperature in your
area.
10
AMBIENT TEMPERATURE
HOSE BAND
DISCHARGE HOSE