Magnetic plugs GN 738 attract iron particles which might be suspended in the liquid.

 

The magnetic pin is of a length which makes it impossible to de-magnetise itself.

 

To avoid breakage or de-magnetising, round rod magnets are fitted with a plastic distance and protection tube. This latter tube has to be removed prior to installing the plug.

 

The seal is retained in a radial undercut  in the mating face which prevents it from dropping off and at the same time it cannot extrude under pressure. For this reason the seal can be of a relatively soft material which will give better sealing.