Brass Adapter M16x1.5 Male O-Ring x 3/8in NPT Female - Freightliner PH222P6MI16 Mack 6635222P6MI16 177.9120CM16
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Fitment
Fits these trucks
Universal - Class 8 tractors and commercial trailersAir brake plumbing on tractors and trailersAdapts a metric M16 x 1.5 port to a 3/8in NPT accessory
Always confirm your year, make & model before ordering.
Part numbers
OEM & interchange numbers
4 cross-refsFreightliner PH222P6MI16 Mack 6635222P6MI16 Parker 222P-6-MI16 Parker 222P6MI16
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 DOT-approved brass thread adapter distributed by FleetPro Parts & Tires. It takes a male M16 x 1.5 thread with an O-ring on one end and gives you a 3/8in NPT female 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 hose end, gauge 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 M16 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. At 0.12 lbs it is a pocket-sized part that keeps a truck moving.
Because this fitting is DOT-approved and meets FMVSS 571.106, it belongs in an actual brake circuit rather than being a shop-grade air hose fitting pressed into service - which matters at inspection time. 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 a brake job is only as good as its weakest connection. This Automann adapter is a direct replacement for highly searched industry numbers including Freightliner PH222P6MI16, Mack 6635222P6MI16 and Parker 222P-6-MI16, also listed as 222P6MI16.
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 plumbing on tractors and trailers
- Male End: M16 x 1.5 with O-ring, for a metric straight-thread port
- Female End: 3/8in 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:
- Freightliner Interchange: PH222P6MI16
- Mack Interchange: 6635222P6MI16
- Parker Interchange: 222P-6-MI16, 222P6MI16
- Automann Distributor #: 177.9120CM16
Technical Specifications
- Component Type: Brass Thread Adapter
- Male Thread: M16 x 1.5 with O-ring
- Female Thread: 3/8in NPT
- Body Material: Brass
- Compliance: DOT-approved, meets FMVSS 571.106 for brake circuits
- Weight: 0.12 lbs
- Package Dims: 1.2 x 1 x 1 in
- Condition: New
- Warranty: 1-Year FleetPro Warranty
- UPC: 889626719141
- Product Level: Fleet Standard Aftermarket
- Brand: Automann (Distributed by FleetPro Parts & Tires)
Key features
- Metric Port to NPT Accessory: Lets a metric M16 x 1.5 valve body, boss or dryer port feed a standard 3/8in NPT hose end, gauge 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.
- DOT / FMVSS 571.106 Compliant: Approved for brake circuits, so the repair passes inspection instead of failing it.
- 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.
- Freightliner, Mack and Parker Interchange: Crosses to Freightliner PH222P6MI16, Mack 6635222P6MI16 and Parker 222P-6-MI16.
Specifications
Component Type
Brass Thread Adapter
Male Thread
M16 x 1.5 with O-ring
Female Thread
3/8in NPT
Body Material
Brass
Compliance
DOT-approved, meets FMVSS 571.106 for brake circuits
Weight
0.12 lbs
Package Dims
1.2 x 1 x 1 in
Condition
New
Warranty
1-Year FleetPro Warranty
UPC
889626719141
Product Level
Fleet Standard Aftermarket
Questions
Will this fit my truck?
This part fits Universal - Class 8 tractors and commercial trailers, Air brake plumbing on tractors and trailers, Adapts a metric M16 x 1.5 port to a 3/8in NPT accessory. Always confirm your year, make and model before ordering.
What part numbers does it replace?
Yes. It is a direct replacement that interchanges with Freightliner PH222P6MI16, Mack 6635222P6MI16, Parker 222P-6-MI16, Parker 222P6MI16.
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.