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USD 13.95
Part #: MIMMRC-11-FRD

Mishimoto MMRC-11-FRD Overflow Reservoir Cap

1999-2016 Ford Powerstroke
Part #: MIMMRC-11-FRD
★★★★★ ★★★★★ 2 Reviews
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The Mishimoto MMRC-11-FRD Overflow Reservoir Cap helps the cooling system in your 1999-2016 Ford 7.3L, 6.0L, 6.4L & 6.7L Powerstroke. Getting the most out of your performance parts comes down to the details. When faced with hard driving conditions, a vehicle's cooling system becomes highly pressurized. Factory caps are not equipped to handle long term use and often lose pressure, in turn reducing the potential coolant boiling point and boiling the coolant. The Mishimoto 1.1 Bar Overflow Reservoir Cap will keep coolant where it needs to be, flowing within the system. This cap replaces Ford part# 9C3Z-8101-B or Motorcraft part# RS-527. 

  • Pressure Tolerance: 1.1 Bar / 16 PSI / 110kPa 
  • Ergonomically Designed For Easy Installation & Removal
  • Includes Mishimoto Lifetime Warranty 

Vehicle Applications

1999 Ford 7.3L Powerstroke
2000 Ford 7.3L Powerstroke
2001 Ford 7.3L Powerstroke
2002 Ford 7.3L Powerstroke
2003 Ford 6.0L Powerstroke
2003 Ford 7.3L Powerstroke
2004 Ford 6.0L Powerstroke
2005 Ford 6.0L Powerstroke
2006 Ford 6.0L Powerstroke
2007 Ford 6.0L Powerstroke
2008 Ford 6.4L Powerstroke
2009 Ford 6.4L Powerstroke
2010 Ford 6.4L Powerstroke
2011 Ford 6.7L Powerstroke
2012 Ford 6.7L Powerstroke
2013 Ford 6.7L Powerstroke
2014 Ford 6.7L Powerstroke
2015 Ford 6.7L Powerstroke
2016 Ford 6.7L Powerstroke


  • MFG. Number MMRC-11-FRD
  • Manufacturer Name Mishimoto
  • Shipping Weight 2.00 lb.
  • Shipping Length 4 in.
  • Shipping Width 4 in.
  • Shipping Height 1 in.
  • Fuel Type Diesel
  • UPC 748354021479
  • Warranty Yes
  • Warranty Info Limited Lifetime
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
  • Internal L4.00R2.00


★★★★★ ★★★★★
1.0/5 Star out of 2 Reviews
Valve failed after a month.
Had it in my truck only a month while the truck actually ran and noticed it wasn't holding pressure and took it off to see the relief valve was stuck sideways or the gasket was in the way either way it wasn't closing so I fixed it and ran for two days then the damn thing split into two pieces losing the valve altogether luckily I had a spare in the truck. Kinda disappointed thinking I was upgrading parts and wasn't. Makes me wonder about the rest of there products. It should be known that I ordered from a different site before I found this one. They are east coast based and I needed a closer company than waiting 5 or more days for parts.
Cap Not Holding 16#
I've only had this cap for 4 months or so now and I just tested it yesterday to find that it is not holding pressure. Not sure if it came that way or if this leak has developed over that short span. Perhaps save a few bucks and go with the XDP cap.

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