The Shop Vac 18' HangUp Vacuum Hose part # 9192800 is a 1.25" hose that fits the 3.5 gallon HangUp vacuum, model QSH30.
The Shop Vac 18 foot HangUp vacuum hose is compatible with 3.5 gallon HangUp vacuum, part # 9520100 and for use with 1.25” wands and tools only (opening about the size of a golf ball).