Your email has been sent!
The STAUFF test couplings type SMK-20, with integrated ball check, are the standard for hydraulic applications using high-viscosity fluids. The SKK-20 version is also available, which can be used for both low and high viscosity fluids, as well as high pulsating pressures, or pneumatic applications.
They use an adapt thread M16 x 2, according to ISO 15171-2. (Connections for fluid use - Hydraulic couplings used for diagnostic purposes – Part 2: Coupling M16 x2 end for connection underpressure)