We have made an improvement to the pressure cap seal which utilizes an acetal disc to keep the o-ring in place. We are providing this, free of charge, to all customers who have purchased a Hyperbloc100 from previous batches. All Hyperbloc100’s from batch #3 (batch numbers are now being laser engraved on the plenum body) already have one of these discs installed.
Note: If you are experiencing a leak from the pressure cap, you should also inspect the o-rings in the valve housing chamber (3). If air is getting past one of those, it can result in air escaping through the 10mm set screw hole which leads to a false impression that the pressure cap seal is failing. You must carefully remove the o-rings without scratching the Hyperbloc100 (use a plastic or brass pick) and then use a borescope if you have one to ensure there is no debris inside of the o-ring grooves.