• Spare valve disks provided. Each unit comes with a 4 seat valve disk block. This block can be easily rotated 90˚ to provide a fresh valve disk sealing surface. • Easily changed from tamper-resistant to T-handle adjustment or vice versa. • Both adjustment assemblies are supplied with every unit. • Brass casing material The BelGAS P39 regulator selection is the largest of its type in the industry. We offer this regulator in three different materials, one of which will ideally suit your application AND your budget. ALL of the P39’s are offered with six different spring ranges. Our broad selection of outlet pressure spring ranges allows more precise regulation of downstream pressure, hence, better process control. Piping designs can be simplified by using any one (or all) of the 3 outlet ports that come standard on the regulator. The BelGAS P39 is the ONLY regulator of this type, which has 3 outlet ports. To enhance the versatility of this regulator further, we provide you with a choice of seat materials that allows the designer to custom fit the seat material with the application.