Triton Pressure Relief Device
Showerdoc Reply:
The PRD is a saftey device and its purpose is to active and blow when there is a vproblem within the shower unit or the water pressure, this is not a spares part that goes faulty.
If this is the second PRD since april then you may find that you have a problem with the shower causing it to activate each time.
The reason the PRD usually activates can be down toy one of the following:
The shower head is blocked and needs cleaned.
The shower hose was kinked whilst showering.
The shower hose inner has collapsed.
The shower head or hose has been changed to a non maufacturer product.
There has been a burst of pressure to the shower or maintenance form the water board in your area.
I would check all of the above before it activates agin to be sure.