A pressure regulator can become defective due to foreign material or a ruined diaphram. (mechanics.stackexchange.com)
tubing to the EGR valve and suck on it with your lips — if suction is not tight, the EGR diaphram is bad and should be replaced. (mechanics.stackexchange.com)
«The holes in the 1 metre thick wood diaphram structure forming the visitor space inside the Seed Cathedral were drilled with great geometric accuracy to ensure precise placement of the aluminium sleeves through which the optic fibre filaments are inserted. (treehugger.com)