4 flow range :0-200ml / min (without speed control circuit) 7 standard pump tube: inner diameter 2.5 * outside diameter 4.5 (mm) silicone tube (pump tube can be changed according to required flow rate ) 8 product weight: 85g 9 hole pitch for set-up: 47mm 10 pump head design is for easy disassembly, easy cleaning and maintenance 11 24 hours soak test is recommened for pump tube before the use of acid / alkali medium.