The H43 Series BASO valve is a combination A valve, B valve, and automatic pilot valve. A manual valve handle with On, Off, and Pilot positions allows operation of the valve without a thermostat. Application include room heaters, wall furnaces, and commercial cooking

The H43 valve contains a plug valve with multiple drillings, which allows it to serve as both the main burner valve and pilot valve. The valve handle indicates the operating position. Safe lighting is accomplished by a positive interlock between the valve handle and reset button, which allows for resetting the valve to the pilot position only. The handle incorporates a lock button to prevent accidentally turning off the valve. The lock button must be lifted to permit turning the plug valve to the Off position.

The main burner may be throttled between the On and Pilot position through the use of the handle.

In the event of pilot flame outage, gas is shut off both to the main burner and pilot burner. The handle must be turned to the Pilot position to reset the valve and light the pilot burner. The pilot outlet is located on the right-hand sisde of the valve casting, when looking into the inlet of the control with the reset button up. The pilot connection is 1/4 cc. It flows toward the inlet of the control and is regulated with a pilot adjustment screw. The pilot connection is also available with the flow toward the outlet of the control (Contact BASO Gas Products.)