The centre mold section five inlet/outlets, one through the top and four along the bottom. The Top will be only for an inlet whilst the four at the bottom could be either an inlet or outlet depending whether the is an actuator section added. Typically there is only one inlet but, if there is to be a more complex module, like the one below, there would be a need for two in the centre section. The graphic below illustrates two inlets with the lower inlet has the tube extending into the second half of the section sealing the central part and allowing the top inflating the side extensions.