Reducing Brass Hex Nipple - 1/2in x 1/4in Male NPT - DOT Air Brake Fitting - Eaton 3325X8X4 Parker 216P84 177.9122DB
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$2.54
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Fitment
Fits these trucks
Universal - tractors and trailersAir brake plumbing on tractors and trailersSteps a 1/2in NPT port down to 1/4in NPT in air brake plumbing
Always confirm your year, make & model before ordering.
Part numbers
OEM & interchange numbers
2 cross-refsEaton 3325X8X4 Parker 216P84
Direct 1-to-1 replacement for every number above. Tap any number to copy.
Overview
Take a big supply port down to a small line in one piece with this DOT brass reducing hex nipple distributed by FleetPro Parts & Tires. One end is 1/2in NPT male and the other is 1/4in NPT male, so a reservoir or manifold boss can feed a gauge, a small valve or a control circuit without a tower of adapters standing off the port. That tower is the real problem: two extra sealing surfaces, a long lever arm on a fitting that lives with constant vibration, and a joint that starts weeping the tanks down long before anyone finds it. Supplied under the Automann brand at Fleet Standard grade, 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.
Big Port To Small Line: The DOT 1/2in x 1/4in Nipple Advantage
This fitting meets FMVSS 571.106 / DOT requirements for brake circuits and is intended for air brake plumbing on tractors and trailers. Both ends are tapered NPT, so each joint draws tighter as it is torqued and seals on the thread itself - and doing the whole reduction in one body means one fitting to install, one to inspect and one to reorder.
The brass body handles the condensate, compressor oil carryover and winter road chemicals that pass through a heavy-duty air system, and it will not gall itself into the cast boss it is threaded into. At 0.2 lbs it keeps the assembly short and light where a stacked adapter would hang weight off the port, and the hex centre gives a wrench proper grip so the nipple is torqued on its own. It also carries the older Automann 177.9513 reference.
At FleetPro Parts & Tires, we know the reducing fitting is the one that decides whether a repair is neat or improvised. This Automann nipple is a direct replacement for highly searched industry numbers including Eaton 3325X8X4 and Parker 216P84.
Vehicle Fitment & Compatibility
This universal-application DOT brass fitting is intended for the following commercial use:
- Make/Model: Universal - tractors and trailers
- System: Air brake plumbing on tractors and trailers
- Threads: 1/2in NPT male x 1/4in NPT male
- Compliance: Meets FMVSS 571.106 / DOT requirements for brake circuits
- Component Group: Air Brake & Wheel / Air System Manifolds & Valves
Direct Replacement & Cross-Reference Numbers:
This Automann brass nipple serves as a direct replacement for the following part numbers:
- Eaton Interchange: 3325X8X4
- Parker Interchange: 216P84
- Supersedes Automann: 177.9513
- Automann Distributor #: 177.9122DB
Technical Specifications
- Component Type: Brass Reducing Hex Nipple
- Threads: 1/2in NPT Male x 1/4in NPT Male
- Body Material: Brass
- Application: Air brake plumbing on tractors and trailers
- Compliance: Meets FMVSS 571.106 / DOT requirements for brake circuits
- Replaces Automann #: 177.9513
- Weight: 0.2 lbs
- Package Dims: 1.4 x 1 x 1 in
- UPC: 889626447280
- Product Level: Fleet Standard Aftermarket
- Brand: Automann (Distributed by FleetPro Parts & Tires)
Key features
- Two Sizes In One Body: A 1/2in NPT male end and a 1/4in NPT male end do the whole reduction, so a reservoir or manifold boss feeds a small circuit directly.
- Meets FMVSS 571.106: Meets FMVSS 571.106 and DOT requirements for brake circuits.
- Short And Light On The Port: At 0.2 lbs it keeps the assembly compact where a stacked adapter would hang weight and leverage off a vibrating boss.
- Tapered NPT Both Ends: Each joint draws tighter as it is torqued and seals on the thread itself, leaving one fitting to install and one to inspect.
- Supersedes 177.9513: Carries the older Automann reference forward for shops ordering from earlier parts lists.
Specifications
Component Type
Brass Reducing Hex Nipple
Threads
1/2in NPT male x 1/4in NPT male
Body Material
Brass
Application
Air brake plumbing on tractors and trailers
Compliance
Meets FMVSS 571.106 / DOT requirements for brake circuits
Replaces Automann #
177.9513
Weight
0.2 lbs
Package dims
1.4 x 1 x 1 in
UPC
889626447280
Product Level
Fleet Standard Aftermarket
Questions
Will this fit my truck?
This part fits Universal - tractors and trailers, Air brake plumbing on tractors and trailers, Steps a 1/2in NPT port down to 1/4in NPT in air brake plumbing. Always confirm your year, make and model before ordering.
What part numbers does it replace?
Yes. It is a direct replacement that interchanges with Eaton 3325X8X4, Parker 216P84.
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.