An apparatus for directing a fluid from an inlet to one of a plurality of outlets that are associated with a wellhead assembly includes a block body having a block inlet and a plurality of block outlets. The present invention shortens the access time of the terminal, improves the access rate of the terminal and the utilization ratio of the access channel, increases the access capability of the system, and reduces the collision probability of access messages. A diffusion path thus separates the fuel cell cathode from the hydrogen generator. The layer of VSD material may be positioned to protect one or more components of the substrate from the transient electrical condition. The ball reception member includes: a plurality of reception portions that receives the ball in one of the reception portions; and a plurality of separation walls that separates the reception portions from one another, wherein the ball reception member is formed separately from the roulette wheel and removably attached to the roulette wheel.