Radium DMR-RA Direct Mount Fuel Pressure Regulator – 8AN ORB, Black

£199.67
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  • Tool-less adjustment
  • Direct mount to 8AN ORB rails
  • 360° swivel vacuum port
  • E85 & methanol compatible
  • 1 auf Lager
  • Secure checkout
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Radium DMR-RA Direct Mount Fuel Regulator 8AN ORB Black

Overview

Radium Engineering DMR-RA (20-1623-00) direct-mount, adjustable EFI fuel pressure regulator in black. It mounts directly to an 8AN ORB fuel rail port – such as on Radium fuel rails – using the included 360° swivelling inlet, or remotely with the optional 20-0624 kit.

Tool-less pressure adjustment with 1psi detents, a 360° swivelling 1:1 vacuum reference port, and compatibility with all petrol types plus methanol, ethanol and E85. Its compact size suits tight engine bays.

Specifications

FitsMX5 NC
PartFueling and Fuel Delivery
Pack sizeRegulator kit
ManufacturerRadium Engineering
Part number20-1623-00
Main inlet6AN ORB female (swivel adapter for 8AN ORB rails included)
Return port6AN ORB, with 90° swivelling 6AN male fitting
Gauge ports2 × 1/8" NPT (plugs included)
Minimum pressure18.5 psi (1.3 bar)
Adjustment1 psi (±0.5 psi) per detent

Mount the regulator directly to a compatible fuel rail port with the included 360° swivelling adapter, or away from the rail using the 20-0624 remote mount kit. Other inlet and return adapters are available separately. The two 1/8" NPT side ports can take a pressure gauge, transducer or temperature probe.

RA-series regulators were the first with tool-less adjustment – no jam nut or set screw. Turn the knob to raise or lower pressure, with detents giving 1 psi (±0.5 psi) per click. A single stainless return orifice creates laminar flow for stable pressure, refined through years of track and bench testing. Maximum pressure depends on your pump's relief valve or controller.

  • 5mm (3/16") barbed fitting – suits 4mm, 5mm and 6mm vacuum hose
  • -3AN male fitting – for 3AN hose ends
  • 1/4" push-to-connect fitting – for hard plastic tubing
  • Vacuum plug – for constant (non-referenced) pressure, e.g. returnless systems
  • Use a wicking medium-strength threadlocker when fitting the vacuum fitting
  • Main rotating assembly
  • 5mm barbed vacuum fitting
  • Vacuum plug fitting (returnless)
  • 1/4" push-to-connect vacuum fitting
  • -3AN male vacuum fitting
  • -6AN male swivel (return line)
  • Swivelling inlet fitting (8AN ORB fuel rail)
  • 2 × PTFE-impregnated 1/8" NPT plugs

Adding a fuel pressure gauge makes adjustments simple.

View the Radium fuel pressure gauge

We do our best to process and ship orders within 1-2 business days (Monday-Friday, excluding holidays). Delivery time depends on location. Below are examples:

UK: 24hrs

Europe: 3-5 days

America and Canada: 5-7 days

Australia: 5-7 days

If you have any questions about your order, you can reach out to our Customer Service team and we will be happy to help.


We Guarantee Everything We Make

If you are not satisfied with one of our products at the time you receive it, or if one of our products does not perform to your satisfaction, please get in touch and we'll make it right. We've been trading for over 2 years and not once had return due to fault or poor quality.

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