Ailbiuko 105PCS Brass Pipe Fittings Assortment Kit NPT Adapter,Reducer Bushing, Hex Nipple, Reducing Hex Coupling,90 Degree Street Elbow,Street Tee,Ball Valve,Hex Head Plugs,Socket Plug Fittings Kits

My shop has an uncanny ability to eat fittings. One minute I’m sure I’ve got the right elbow and a reducing bushing, the next I’m staring at a half-assembled manifold and an empty bin. That’s what prompted me to try the Ailbiuko brass fitting kit—a 105-piece assortment of NPT adapters, nipples, elbows, tees, couplings, plugs, and a few ball valves. After a few weeks of using it across air, vacuum, and oil test rigs, I’ve got a clear picture of where this kit shines and where it asks for a little patience.

What you actually get—and how it plays out in the shop

The assortment focuses on the basics that keep projects moving:
- Reducing adapters and bushings for stepping between common NPT sizes
- Hex nipples for joining components inline
- Female couplings and reducing couplings
- 90-degree street elbows (male x female) and female x female elbows
- Street tees
- Hex head plugs and socket plugs
- A few compact ball valves
- A roll of PTFE tape

That mix is practical. In real use, I leaned heavily on the bushings, nipples, and elbows to reconfigure an air compressor manifold and to assemble a compact vacuum pump setup. The tees and valves helped me create quick shutoffs and branch lines without hunting for standalone parts. A couple of adapters saved me from dead ends when a regulator and gauge didn’t share sizes. In short, the assortment has the right “glue” pieces to keep you from running out to the store mid-build.

My only gripe about the mix: it’s generous on plugs and light on tees and valves. I also found myself wishing there were a couple of female caps (to terminate male threads). Plugs are great for closing ports; caps are better when you’ve got a male stub that needs protection or temporary termination. Not a deal-breaker, but worth noting if you do a lot of test setups.

Material and threading quality

The fittings are CA360 forged brass. That matters: CA360 machines cleanly and is a standard choice for fittings thanks to good corrosion resistance and low magnetic permeability. The forging yields a denser part than a cheap cast fitting, and in hand these don’t feel flimsy. The threads are consistent and clean—no crushed peaks or ragged burrs that chew up mating parts. I could usually run seven or eight turns by hand before needing a wrench, which is exactly what I want to see for tapered NPT threads.

I inspected the sealing surfaces under magnification out of habit. The major/minor diameters look correct, and the taper engages predictably. In testing, I didn’t see the telltale weeping you get from poorly cut threads. Most joints sealed the first time with two to three wraps of PTFE tape. When I was threading brass into aluminum components, I preferred a liquid sealant to minimize galling and make future disassembly cleaner—PTFE tape works, but liquid sealant reduces the chance of tape shreds getting into sensitive systems.

In use: air, vacuum, oil

• Compressed air: I built a small regulator/gauge/quick-couple tree and an isolation manifold for an 80-gallon compressor. With shop air cycling between 90 and 125 PSI, the joints held without drama. The ball valves have a smooth quarter-turn action and didn’t leak under soapy water testing. They look like standard-port valves; flow feels fine for tool use. If you need maximum flow for a blast cabinet, you’ll want to confirm the porting or step up to a known full-port valve.
• Vacuum: For a rotary-vane pump test rig, the street elbows kept the assembly compact, and the bushings let me marry mismatched ports. With a smear of vacuum-rated pipe dope, the fittings pulled down and held vacuum reliably. As with any NPT elbow, clocking can be fussy—getting the elbow to point exactly where you want at the right torque sometimes takes a back-off-and-rewrap cycle. That’s normal for tapered threads.
• Oil: I mocked up an oil pressure test line using a reducing bushing and a nipple. No leaks at low pressure, and the brass didn’t react to the petroleum oil. As a rule, I avoid PTFE tape on fuel or oil systems where fragments could cause trouble; an anaerobic or PTFE paste sealant rated for hydrocarbons is a safer bet.

The published operating temperature range of −65°F to 250°F is suitable for most shop setups, refrigeration lines, and general fluids. I would not use these for live steam or high-temperature exhaust; they’re not rated for that. Under-hood automotive spots can creep toward the upper limit, so pick your locations with care.

Fit, finish, and ergonomics

Edges are clean, hex flats are crisp, and wrench engagement is positive. I didn’t encounter any out-of-square faces or burrs that would compromise torque. The hex head plugs and socket plugs are particularly handy for tidy port closures: the socket plugs sit nearly flush and read “finished” in a panel or block.

Threads engage smoothly and predictably. If you’ve ever fought a bad batch of fittings where every joint cross-starts, you’ll appreciate that I didn’t have to chase any threads or reach for a die. That said, apply good thread hygiene—clean male/female threads, wrap in the direction of tightening, and don’t over-torque. Brass will forgive you a little; it won’t forgive a cheater bar.

A note on standards and safety

These are NPT fittings. NPT sizes are nominal—don’t measure a 1/4 NPT fitting with calipers and panic when it’s not 0.25 inches. They’re designed to seal by thread interference plus sealant. If you need flare, compression, or O-ring face seals, this kit won’t replace those. Also, CA360 brass commonly contains lead. If you’re plumbing potable water or you need NSF/ANSI 61/372 compliance, you’ll want certified lead-free fittings. For fuel systems, use appropriate sealant and check for rating compatibility.

What I’d change

• Fewer plugs, more tees. One extra street tee goes a long way in small manifolds.
• Another ball valve or two. They’re the most valuable items in the box during prototyping.
• Include at least a couple of female caps. They fill a gap that plugs don’t.
• Thicker PTFE tape. The included roll works, but it’s on the thin side; three- to four-mil tape or a small tube of paste would reduce the number of wraps.

None of these are fatal flaws; they’re quality-of-life improvements that would make a good kit even better.

Who benefits most

• Home shops and makers who regularly assemble air and vacuum rigs
• HVAC and appliance tinkerers who need quick adapters on hand
• Auto hobbyists building test setups for gauges, pressure/vacuum diagnostics, and fluid transfer
• Small maintenance teams that value a catch-all bin to avoid downtime

If you only need a single fitting for a one-off repair, buying a la carte still makes sense. If you touch threaded connections a few times a month, this kit pays for itself in saved trips and stalled projects avoided.

Value and durability

As a value proposition, it’s strong. The cost of six or seven fittings at a hardware store can approach the price of the entire kit, and the assortment ensures you’ve got options when a plan changes mid-assembly. The brass has held up to multiple cycles of assembly/disassembly without rounding or thread wear that would worry me. Wipe them down after use in corrosive environments and they’ll live a long, useful life.

Bottom line and recommendation

I recommend the Ailbiuko brass fitting kit for anyone who regularly works with NPT-threaded air, vacuum, oil, or general fluid lines. It earns its keep by pairing solid CA360 brass and clean threads with a mix that covers the most common connection problems. The ball valves are smooth and tight, the elbows and bushings are plentiful enough for real builds, and the overall consistency inspires confidence.

It’s not perfect—there’s room for more tees, another valve, and a couple of caps, and the included PTFE tape is serviceable rather than great. But those are small trade-offs next to the convenience and reliability on offer. If you want a ready drawer of fittings that lets you finish the job today rather than after another run to the store, this kit is the right call.