usable gas liquid separator are not limited to those for example water absorbent polymer a porous material consisting of polytetrafluoroethylene or the like paper fibers such as japanese rice paper water absorbent fibers such as cotton wool can be used in place of the filter 154 as shown in fig8 a liquid reservoir tank 180 to serve as the trap for liquid can also be used as a gas liquid separator the liquid reservoir tank 180 is so installed that two pipes 182 and 183 penetrate a lid 184 the lower ends of the pipes 182 and 183 are arranged above the liquid surface the tube 64 or the tube 80 is connected to one pipe 182 and the other pipe 183 communicates with the duct 118 see fig3 when liquid and gas flow from the tube 64 into the liquid reservoir tank 180 configured in this way via the pipe 182 liquid is left in the reservoir tank 180 and only gas is extracted from the other pipe 183 therefore liquid can be prevented from entering into the body 102 the reservoir tank 180 may as well be configured as shown in fig9 the pipes 182 and 183 for the reservoir tank 180 in fig9 are connected to a bypass pipe 185 and the bypass pipe 185 is provided with a non return valve 186 for preventing flow from the pipe 182 to the pipe 183 the pipe 183 in the reservoir tank 180 is provided with a non return valve 187 for preventing flow to the reservoir tank 180 when fluid from the first or second tube 64 or 80 is sucked into the reservoir tank 180 configured in this way the fluid.