Test couplings with poppet valve (SKK) from the STAUFF Test 12 series with connection thread S12.65x1.5 as bulkhead version. Available in steel with high-quality zinc/nickel coating, or optionally in V2A and V4A stainless steel. Maximum operating pressure of 630 bar. Coupling under pressure up to 400 bar. Knurled cap made of metal.