Pneumatic Valve Assembly, Main Gas, Dr. Oligo. This is the replacement assembly for the main gas valve when your old valve is a round valve made by Neptune Research (NR). If you already have a pneumatic valve installed and you need just the pneumatic valve or just the pilot valve you should order a different part. For the pneumatic valve only order PN: 615-105010. For the pilot valve only order PN: 603-104705.