Product Description
If you've ever looked at the air inlet on a pneumatic drill and thought, "how does the hose actually connect to that?", you've bumped into the problem that tail pipe couplings — conutos, as they're known across much of Latin America — are designed to solve.
The BDL132 is a 1/2-inch tail pipe coupling. It's a short adapter with male threads on one end that screws into your drill's air inlet, and a hose barb or stem on the other end that the air hose pushes onto. It's the bridge between your equipment's threaded port and your flexible air hose.
The "Forgotten Fitting" Problem
Of all the pneumatic fittings we sell, tail pipe couplings are the most commonly overlooked. Here's why: they're small, they're simple, and once they're installed, they tend to stay in place for a long time. They don't get removed and reinstalled like clamp couplings or quick-connects. They just... sit there.
Until they don't.
When a tail pipe fails — usually because the threads have corroded, the barb has cracked from vibration, or someone accidentally bent it while moving the drill — the replacement is almost never in the toolbox. Because nobody remembers to order them. They're too small, too cheap, too easy to forget.
And then you're back to improvising.
The BDL132 is the antidote to that problem. At roughly $0.85 each, you can order 20 of them and not feel it in your budget. Put them in the parts box. When one fails — and it will, eventually — swap it in five minutes and move on.
How It Differs from Thread Couplings (Interno/Externa)
This is a distinction worth understanding:
| Coupling Type | What It Does | Example |
|---|---|---|
| Interno (female thread) | Connects TO a male-threaded port | BDL122 |
| Externa (male thread) | Screws INTO a female-threaded port | BDL112 |
| Conuto (tail pipe/nipple) | Bridges between a threaded port AND a hose | BDL132 |
The conuto does something that standard thread couplings can't: it provides a hose connection point on equipment that has a threaded inlet. Instead of needing a separate coupling AND a hose clamp, the tail pipe gives you both in one piece.
Sizing and Compatibility
The BDL132 has 1/2-inch male threads (G1/2 BSPP) on the equipment end and a 1/2-inch hose barb on the hose end. It's sized for equipment with G1/2 female air inlets, which includes:
Y24 hand-held rock drill
Y26 pneumatic rock drill
B47 pneumatic breaker
G10, G12, G15, G16 pneumatic hammers (air picks)
C6 pneumatic breaker
For the hose side, use a 1/2-inch inner diameter air hose secured with a hose clamp or the SL34 abrazadera.
Installation
Wrap the male threads with 2–3 turns of PTFE tape (clockwise when looking at the thread end)
Screw the tail pipe into the equipment's air inlet by hand until firm
Add 1/4 turn with a wrench — do not over-tighten
Push the air hose onto the barb end
Secure with a hose clamp (SL34 or similar) positioned behind the barb's last ridge
Technical Specifications
| Specification | Detail |
|---|---|
| Product Code | BDL132 |
| Type | Conuto (tail pipe / nipple adapter) |
| Thread Size | 1/2 inch (G1/2 / BSPP), male |
| Hose Barb Size | 1/2 inch |
| Working Pressure | 0.4–0.63 MPa |
| Material | Brass |
| Application | Thread-to-hose adapter for small pneumatic tools |
| Unit Price (EXW) | ~$0.85 USD |
Frequently Asked Questions
Q: Why do I need a tail pipe if I already have a hose clamp coupling (abrazadera)? They do different things. The abrazadera (SL34) clamps the hose to itself — it secures the hose but doesn't connect it to the drill. The conuto (BDL132) has threads that screw into the drill's inlet AND a barb that the hose fits over. You typically need both: the conuto makes the connection, and the abrazadera or hose clamp keeps the hose from blowing off the barb.
Q: Can I use Teflon tape AND a hose clamp at the same time? Yes, and you should. PTFE tape goes on the threaded end (where the tail pipe meets the drill inlet). The hose clamp goes on the barb end (where the hose meets the tail pipe). They seal different parts of the connection.
Q: The tail pipe on my drill is bent. Can I bend it back? If it's a slight deflection (a few degrees), you might get away with carefully straightening it. But brass work-hardens when bent, and a straightened tail pipe will be weaker at the bend point. If it's visibly bent, replace it. The cost of a new BDL132 is trivial compared to the risk of a crack propagating under pressure.
Q: Is the hose barb size the same as the thread size? In this case, yes — both ends of the BDL132 are 1/2 inch. But this isn't always the case with tail pipe fittings. Some models have different thread and barb sizes (a reducer). The BDL132 is a straight 1/2" to 1/2" adapter.