Threaded plugs with and without symbols, Aluminium, resistant up to 100 °C, blac (741-22-M16X1,5-ESS-1)

Threaded plugs GN 741 are fitted with outside diameter d1 to suit screw holes with BSP threads to DIN 3852.
The sealing ring is bedded into a undercut groove which prevents it from dropping out and at the same time stops it from being extruded when tightening the cap.