Coolant hose Diameter?

Anyone happen to know the diameter for part # 5LV-1243A-10-00 HOSE 1
(This is the hose that goes from top left area of the Head down to below/left of the front sprocket)?

Seems availability is NIL and it 3+ weeks, if that before any (reputable) vendor thinks they can get them in, thus leaving me to try to...make something to work in the interim.
(Currently out town, so can't measure/check it myself and trying to...reduce further delays)
 
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