SNV stop gauge are designed as service valves with a very sturdy construction. SNV-ST are made in steel approved for low temperature operations. SVA-SS are stainless steel versions. SNV valves have internal back seating (metal to metal), enabling the spindle seal to be replaced while the valve is still under pressure. SNV-ST and SNV-SS are available in standard branch length configuration as well as extended branch configuration, with extension length versions from 50 to 150 mm.