Brass Hex Head Plug - 1/4in Male NPT Port - Eaton 3152X4 Parker 218P4 177.9121B
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$0.78
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Fitment
Fits these trucks
Universal - trucks, tractors and trailersNPT air-brake and air-line connectionsCaps an unused 1/4in NPT port on truck and trailer air lines
Always confirm your year, make & model before ordering.
Part numbers
OEM & interchange numbers
8 cross-refsEaton 3152X4 Meritor 1250H1308 Parker 218P4 Watson and Chalin 17428 Watson and Chalin 17628 121B 017053 SPPH4
Direct 1-to-1 replacement for every number above. Tap any number to copy.
Overview
Cap an open air port the right way with this brass hex head plug distributed by FleetPro Parts & Tires. It threads into a 1/4in male NPT connection and closes it off for good - the standard fix for an unused manifold port, a spare tee leg, or a valve boss left open after a component came off the truck. A port that is open, cracked or stuffed with the wrong plug is a slow leak, and a slow leak means the compressor cycles all day, the tanks bleed down overnight and the driver spends the first minutes of the shift waiting on air pressure. 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.
A Port That Stays Sealed: The Brass Hex Plug Advantage
This is standard NPT pipe connection hardware for truck and trailer air-brake and air-accessory plumbing, not a hardware-store improvisation. The 1/4in male NPT thread is tapered, so it draws tighter the deeper it is torqued and seals on the thread flanks themselves - pipe sealant on assembly is normal practice and keeps the joint dry through heat cycles, vibration and winter salt.
The brass body is what makes it a keeper. Brass shrugs off the moisture, road salt and compressor oil that live inside a heavy-duty air system, and unlike a plated steel plug it will not rust or gall itself into a cast valve body - which matters on the day somebody needs that port back for a gauge, a sensor or an added circuit. The hex head takes an ordinary wrench or socket, so the plug seats tight on install and backs out cleanly years later instead of rounding off.
At FleetPro Parts & Tires, we know an air system is only as tight as its smallest fitting. This Automann plug is a direct replacement for highly searched industry numbers including Eaton 3152X4, Parker 218P4, Meritor 1250H1308, and Watson and Chalin 17428 and 17628.
Vehicle Fitment & Compatibility
This universal-application brass fitting is intended for the following commercial use:
- Make/Model: Universal - trucks, tractors and trailers
- System: NPT air-brake and air-line connections
- Thread: 1/4in male NPT
- Component Group: Air Brake & Wheel / Air System Manifolds & Valves
Direct Replacement & Cross-Reference Numbers:
This Automann brass plug serves as a direct replacement for the following part numbers:
- Eaton Interchange: 3152X4
- Meritor Interchange: 1250H1308
- Parker Interchange: 218P4
- Watson and Chalin Interchange: 17428, 17628
- Additional Interchange: 121B, 017053, SPPH4
- Automann Distributor #: 177.9121B
Technical Specifications
- Component Type: Brass Hex Head Plug
- Thread: 1/4in Male NPT
- Body Material: Brass
- Application: Universal - air-brake and air-accessory plumbing
- UPC: 889626447174
- Product Level: Fleet Standard Aftermarket
- Brand: Automann (Distributed by FleetPro Parts & Tires)
Key features
- Seals An Open Port For Good: Threads into an unused 1/4in NPT connection and closes it, so the air system stops bleeding down through a port that was never capped properly.
- Solid Brass Body: Brass shrugs off the moisture, road salt and compressor oil inside a heavy-duty air system and will not rust or gall itself into a cast valve body.
- Tapered NPT Thread: The 1/4in male NPT taper draws tighter as it is torqued and seals on the thread flanks, so a dab of pipe sealant finishes a dry joint.
- Hex Head Drive: The external hex takes an ordinary wrench or socket, so the plug goes in tight and comes back out years later without rounding off.
- Wide Shop Interchange: Covers the common counter numbers including Eaton 3152X4, Parker 218P4, Meritor 1250H1308 and Watson and Chalin 17428.
Specifications
Component Type
Brass Hex Head Plug
Thread
1/4in Male NPT
Body Material
Brass
Application
Universal - air-brake and air-accessory plumbing
UPC
889626447174
Product Level
Fleet Standard Aftermarket
Questions
Will this fit my truck?
This part fits Universal - trucks, tractors and trailers, NPT air-brake and air-line connections, Caps an unused 1/4in NPT port on truck and trailer air lines. 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 3152X4, Meritor 1250H1308, Parker 218P4, Watson and Chalin 17428, Watson and Chalin 17628, 121B, 017053, SPPH4.
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.