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Brass Adapter M12x1.5 Male O-Ring x 1/4in NPT Female - Mack 6635222P4MI12 Parker 222P-4-MI12 177.9120BM12
Brass Adapter M12x1.5 Male O-Ring x 1/4in NPT Female - Mack 6635222P4MI12 Parker 222P-4-MI12 177.9120BM12
Automann

Brass Adapter M12x1.5 Male O-Ring x 1/4in NPT Female - Mack 6635222P4MI12 Parker 222P-4-MI12 177.9120BM12

In stock
SKU: 177.9120BM12
$5.90
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Fitment

Fits these trucks

Universal - Class 8 tractors and commercial trailersAir brake and air system plumbing on tractors and trailersAdapts metric ports to NPT accessories
Always confirm your year, make & model before ordering.
Part numbers

OEM & interchange numbers

3 cross-refs
Mack 6635222P4MI12 Parker 222P-4-MI12 Parker 222P4MI12
Direct 1-to-1 replacement for every number above. Tap any number to copy.
Overview

Put an NPT accessory on a metric port with this brass thread adapter distributed by FleetPro Parts & Tires. It is a brass air fitting that takes a male M12x1.5 thread with an O-ring on one end and gives you a 1/4 in female NPT on the other, which is exactly what you need when a metric valve body, sensor boss or air dryer port has to feed a standard NPT gauge, hose end or accessory line. Trying to force an NPT fitting into a metric port is how ports get ruined. Manufactured by Automann to Fleet Standard specifications, we stock these heavily right here in our Hanover Park, Illinois warehouse to ensure lightning-fast shipping for fleets, diesel repair shops, and owner-operators nationwide.

Metric Port, NPT Accessory: The M12x1.5 Adapter Advantage

The important detail on this adapter is the O-ring on the male thread. A metric straight thread does not seal on the threads the way a tapered NPT thread does - it seals on the O-ring face at the bottom of the boss. That means you tighten it down to seat the seal and stop, with no sealant tape, no pipe dope and no guessing at how many turns past finger tight. It also means the joint can be taken apart and put back together without the slow, one-way tightening that eventually splits a cast metric boss.

The 1/4 in female NPT end is ordinary tapered pipe thread, so anything in the shop drawer threads straight in with tape or dope as usual. The brass body handles the moisture, road salt and compressor oil that live inside a heavy-duty air system and will not gall or seize into a valve body the way a steel fitting can. At FleetPro Parts & Tires, we know an air system is only as good as its weakest joint. This Automann adapter is a direct replacement for highly searched industry numbers including Mack 6635222P4MI12 and Parker 222P-4-MI12, also listed as 222P4MI12.

Vehicle Fitment & Compatibility

This universal-application DOT brass fitting is intended for the following commercial use:

  • Make/Model: Universal - Class 8 tractors and commercial trailers
  • System: Air brake and air system plumbing on tractors and trailers
  • Male End: M12x1.5 with O-ring, for a metric straight-thread port
  • Female End: 1/4in NPT, for standard NPT accessories
  • Component Group: Air Brake & Wheel / Air System Manifolds & Valves

Direct Replacement & Cross-Reference Numbers:

This Automann brass adapter serves as a direct replacement for the following part numbers:

  • Mack Interchange: 6635222P4MI12
  • Parker Interchange: 222P-4-MI12, 222P4MI12
  • Automann Distributor #: 177.9120BM12

Technical Specifications

  • Component Type: Brass Metric-to-NPT Thread Adapter
  • Male Thread: M12x1.5 with O-Ring
  • Female Thread: 1/4in NPT
  • Body Material: Brass
  • Application: Universal
  • UPC: 889626719127
  • Product Level: Fleet Standard Aftermarket
  • Brand: Automann (Distributed by FleetPro Parts & Tires)
Key features
  • Metric Port to NPT Accessory: Lets a metric M12x1.5 valve body, boss or dryer port feed a standard 1/4 in NPT gauge, hose end or accessory line.
  • O-Ring Sealed Male Thread: Seals on the O-ring face instead of the threads, so there is no tape, no dope and no guessing past finger tight.
  • Reusable Joint: An O-ring seal can be taken apart and reassembled without the one-way tightening that splits a cast metric boss.
  • Solid Brass Construction: Brass shrugs off the moisture, road salt and compressor oil inside a heavy-duty air system and will not gall into a valve body.
  • Mack and Parker Interchange: Crosses directly to Mack 6635222P4MI12 and Parker 222P-4-MI12, also listed as 222P4MI12.
Specifications
Component Type
Brass Metric-to-NPT Thread Adapter
Male Thread
M12x1.5 with O-Ring
Female Thread
1/4in NPT
Body Material
Brass
Application
Universal
UPC
889626719127
Product Level
Fleet Standard Aftermarket
Questions
Will this fit my truck?
This part fits Universal - Class 8 tractors and commercial trailers, Air brake and air system plumbing on tractors and trailers, Adapts metric ports to NPT accessories. Always confirm your year, make and model before ordering.
What part numbers does it replace?
Yes. It is a direct replacement that interchanges with Mack 6635222P4MI12, Parker 222P-4-MI12, Parker 222P4MI12.
How fast does it ship?
In-stock orders placed before 12 PM Central on business days ship the same day from our Hanover Park, IL warehouse, and typically arrive in 2 to 5 business days anywhere in the USA.
What's your return policy?
Unused items in original packaging can be returned within 30 days, backed by our 30-day money-back guarantee. If we ship the wrong part, we cover the return label and send the correct one.