For mono scuba equipment (all tank diameters) with tank neck thread according to US-Standard ¾“ NPSM. Nautec S – Valves are standard shut off devices in accordance to DIN EN 12209 (Pipe G 5/8“), for an max. operating pressure of 232 bar with vertical arranged shut-off mechanism and outlet. Only 1 first stage can be connected. Equipped with “Full-Metal-Core-Rubber Knobs” (for maximum grip) and a green marker ring.