Uxcell a15112000ux0004 Adjustable Knob 0.5-5GPM 2-18LPM Water Flow Meter Panel Type Flowmeter Product Name: Panel Type Flow Meter; Model: LZT M-15; Applicable Medium: Water Measure Range: 0.5-5GPM,2-18LPM; Male Thread Diameter: 20mm/1/2BSP; Thread Pitch: 14G 2-Port Center Distance: 128mm/5"; Internal Hole Diameter: 12mm/0.47"; Overall Size: 175 x 90 x 32mm/6.9" x 3.54" x 1.26"