Helmut, that you dont have any trouble with making a safe system is already known to me, and that wasnt my point.
Just commenting that in most dual systems this PRD point is mostely adressed to, on the exception of customized things.

I myself have equiped several robots with custom PRDs,or these were completey selfbuild(copies in better material)or adapted bought ones, Non came with a lead seal.

Now my main Q, as in robot wars many people are pushing the limits of the stuff, and in some cases invent new things to do wath they want,How are the technicals going to check if all complies tot the FEA rules.

In Robot Wars I never had any pressure check on the PRDs, and these arent cheap components when bought.So why fit them, the take space, weight and money.. and nobody bothered?

Also, Im somewhat the main CO2 man in the Netherlands and Belgium,and I want to know... does anyone has an idea to check everything works like it should...Some of the roboteers can build good stuff, but this leaves open the possibility of mistakes or wrong messurements.