A vapor delivery needle is provided that may include any of a number of features. The manufacturing method is much simplified, reduced in cost and increased in reliability, repeatability and yield over manufacturing techniques for known multipole deflectors. Some of the components control the interaction between modules, while other components perform specific functions for associated modules. The sealing member may have a substantially circular shape and surround the inner member. In some situations, the techniques are used in conjunction with a fee-based program execution service that executes multiple programs on behalf of multiple users of the service. This angle is chosen to permit the slide out room floor to drop to a position flush with the main floor when the slide out room is in the extended position.