Tee with 1/8NPT Female 2pk ALL50139

OVERVIEW

When you are deep into a custom air-cooled VW build or a high-performance brake system overhaul, the small details often dictate the success of the entire project. The Allstar Performance 1/8-inch NPT Female Brass Tee 2-pack is an essential component for any builder looking to streamline their plumbing. These tees are meticulously engineered to provide a reliable, leak-free junction for a variety of fluid systems. Whether you are splitting a brake line, plumbing an oil pressure gauge, or setting up a complex vacuum system for a dual-carburetor engine, these fittings provide the structural integrity and precision threading required to handle the vibrations and heat cycles typical of a high-revving Boxer engine. At Appletree Auto, we know that using inferior "parts store" brass can lead to stripped threads and catastrophic leaks, which is why we recommend the race-proven quality of Allstar Performance for your Beetle, Ghia, or off-road rail.

This 2-pack of 1/8-inch NPT female tees is particularly popular among the air-cooled community for adding secondary sensors without sacrificing factory functionality. One of the most common uses is at the oil pressure relief gallery; by using this tee, you can retain your stock oil pressure "idiot light" sending unit while simultaneously plumbing in a mechanical or electric oil pressure gauge to monitor your engine''s health in real-time. The heavy-duty brass construction offers superior corrosion resistance compared to standard steel fittings, making them ideal for the harsh environments of the underside of a Transporter or the exposed chassis of a Dune Buggy. With Allstar Performance, you aren''t just getting a fitting; you are getting the peace of mind that comes with hardware designed for the rigors of the track and the longevity of the street.

FITMENT

While these are universal 1/8-inch NPT fittings, they are most commonly utilized in the following air-cooled VW and off-road applications:

• Volkswagen Beetle: All years and models for brake line junctions and oil pressure gauge installation.
• Volkswagen Karmann Ghia: Ideal for custom gauge clusters and hydraulic brake upgrades.
• Volkswagen Bus / Type 2: Perfect for extended oil cooling lines and vacuum advance plumbing.
• Volkswagen Type 3 (Squareback, Fastback, Notchback): Used in tight engine bays for sensor relocation.
• Volkswagen Thing (Type 181): Robust enough for rugged terrain and military-style builds.
• Dune Buggies & Sand Rails: Essential for custom chassis brake line routing and hydraulic clutch systems.
• Universal Applications: Fits any 1/8-27 NPT male fitting across automotive, industrial, and marine sectors.

SPECS

The technical specifications of the ALL50139 ensure compatibility with industry-standard plumbing components:

• Material: High-quality forged brass for maximum durability and corrosion resistance.
• Thread Size: 1/8-inch - 27 NPT (National Pipe Thread).
• Configuration: 3-Way Female Tee (All three ports are female).
• Quantity: Pack of 2 (Two tees included per package).
• Pressure Rating: Rated for high-pressure automotive fluid systems including brakes and oil.
• Finish: Natural brass finish for a classic look and easy inspection of thread integrity.
• Part Number: ALL50139.

PRO TIPS

1. Proper NPT Thread Sealing

National Pipe Thread (NPT) is a tapered thread design that relies on "interference fit" to create a seal. Unlike AN fittings or flare fittings, NPT threads actually deform slightly as they are tightened. To ensure a leak-free seal, always use a high-quality PTFE (Teflon) tape or a dedicated liquid thread sealant. When applying tape, start two threads back from the end of the fitting to prevent any stray pieces of tape from breaking off and entering your oil galleries or brake lines, which could cause a blockage or mechanical failure. Tighten the fitting until snug, then turn it an additional 1.5 to 2 full turns to achieve the correct seal depth.

2. Adding Gauges Without Losing Factory Warnings

Many VW owners want to add a mechanical oil pressure gauge but don''t want to lose the factory dashboard warning light. This tee is the perfect solution. Simply remove your stock oil pressure sending unit (located near the distributor on most Type 1 engines), thread this tee into the block using a 1/8 NPT adapter if necessary, and then thread your stock sender into one side of the tee and your new gauge line into the other. This allows both systems to read from the same pressure source, giving you the best of both worlds: a precision readout and a bright red "stop now" light if pressure fails.

3. Avoiding Over-Torque in Cast Aluminum

When installing these brass tees into the magnesium or aluminum cases of an air-cooled engine, remember that the brass is harder than the engine case material. It is very easy to over-tighten a tapered NPT fitting and crack the engine case or the oil pump cover. Always use a backup wrench if you are connecting hoses to the tee after it is installed. This prevents the torque from the hose installation from twisting the tee deeper into the engine case, which could lead to expensive structural damage. If you feel excessive resistance before the fitting is seated, back it out and inspect the threads for burrs or debris.