I've never seen one, but by the below...it's flexable.
Inspect the Pyrovalve™ element (short, solid black pellet, 5/8" O.D X
1/4" thick) for chips, cracks or other defects. Check the structural
integrity of the Pyrovalve™ element by grasping with the thumb and
forefingers of both hands and flexing the element back and forth with
I've got a friend who has a system he is interested in selling to me. If we make a deal I'll measure and photograph the pyrovalve and post them here. It'll be awhile, maybe March.
If it does flex then it is defective. It was a compressed puck of BP.
I have seen them, used them, and still have a few.
I want to thank all that replied !
What I was/am looking for, is someone who has actually reproduced these, whether with epoxy or otherwise.