Abstract: To facilitate various distances between a bus rooftop mounted condenser and the air conditioning components below the rooftop, a bulkhead plate is provided with a pair of spaced tubes whose vertical positions can be selectively adjusted to accommodate any possible installation requirement of various possible rooftop shapes. A standard tube and fixture assembly can therefore be used by adjusting the respective distances that it extends above and below the bulkhead plate. A compression fitting is provided to obtain a leak proof fluid connection between the components.