The aim of the invention is to create a gas regulating fitting which, once a gas stove has been successfully started up, can switch the pilot burner into the off position when the main burner is in the off position, in order to maintain the power consumption of the gas stove as low as possible. The drive axle housing system includes apparatus for incorporation into the axle, the apparatus including an oil churning reduction member that may be affixed to the interior walls of the axle housing. Upper and lower pairs of lugs extend from the interspinous portion for interfacing with the respective spinous processes. The bridge fittings may also be mounted to the locator plate in multiple directions forming multiple flow paths. The service assistance device may further include a service call button which, when depressed, automatically sends a call for service to an HVAC contractor over a communication network, such as a telephone or computer network, using prerecorded contact information for the HVAC contractor. If the bound on the stack depth cannot be violated, the fixed stack routing process merges every two consecutive levels in the stack to one level.