The 4″ and 4 ½″ Hose Monsters are designed for flow testing large-capacity systems and unidirectional flushing through the steamer/pumper port of a hydrant.
- 4″ FM Approved Flow range: 1,074 GPM to 2,941 GPM.
- 4½″ FM Approved Flow range: 1,047 GPM to 2,867 GPM.
Both units are constructed of steel and include a precision-machined internal orifice plate for accurate and consistent flow rate measurements. The rugged steel orifice plate means that a flow test will never be interrupted due to rocks and flushing debris damaging a pitot.