Hypro pressure regulator is used on most brands of truckmounts and many pressure washers  including Scouts, Hydramaster, ChemTex Panther (older), Amtex, Prowlers, Prochem, Hornets, and many others 
Dual 3/8" Female pipe thread.

Water flow is comes in from the side port and bypasses out the bottom port. This is a widely used part in the industry and is easily rebuildable.
Water flow is in from the side and out the bottom port.
Can be adjusted from 100 psi to 2000 psi.

To learn more about fixing these, please visit
Repair page

also marketed under part number 3300-0084, Hydramaster PHY169-101, HYP33000084

Used on:
Hydramaster: Spitfire 3.2, Spitfire
4.0, Crossfire 3.7, Crossfire 4.2, Crossfire 4.4, Profire 3.7,
Profire 4.7, Bobcat 3.5, Aquacat 3.5/3.9, Hydracat 3.5, Hydracat
4.0, Hydracat 4.5, CDS 4.2, CDS 4.5, CDS 4.6, CDS 4.7 & CDS 4.8
Bridgepoint: Dagger
US Product Cobra