Shanghai Sunrise Instrument Co.,Ltd. was foundded in Jan.2008.We specialized in sampling equipments such as gas sample bags ,flue gas sample bag,liquid dan solid sampling bags,sampling bumps,gas sampling vacuum chambers. E-Switch brand. According to E-Switch design concept,we have developed our own dedicated flow-adjustable multi-functional valves,teflon valves and gas nozzles wchich have won several national patents. E-Switch flow-adjustable multi-functional valves better complete functions and interface sizes in this line and they can be applied to hoses with 3 to 6mm in diameter. They don't leak even when taken for samples for 15 times,which is of number one priority in the industry ..