Branch Connections / CPLT
Coupolet
Economical outlet using a threaded coupling body for small branches.
Technical Specifications
Key Features
- Threaded coupling body
- Economical solution
- Fast assembly
- Compact design
- Standard thread forms
- Easy maintenance
Applications
- Small service lines
- Instrumentation
- Plumbing
- Temporary connections
- Low-pressure services
- Maintenance taps
Design Features
- Short body
- Threaded end (NPT/BSPT)
- Tight tolerances
- Quick from stock
- Lightweight
- Certified
Connection Performance
Dimension Table
| Branch Size | Run Size | Thread Type | Body Length (mm) | Wall Thickness (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 1/8" | 3/4" | NPT | 28 | 2.6 | 0.03 |
| 1/4" | 1" | NPT | 32 | 3.0 | 0.05 |
| 3/8" | 1-1/4" | NPT | 35 | 3.4 | 0.07 |
| 1/2" | 1-1/2" | NPT | 38 | 3.7 | 0.10 |
| 3/4" | 2" | NPT | 44 | 4.0 | 0.16 |
| 1" | 2-1/2" | NPT | 51 | 4.3 | 0.22 |
Technical Notes
- 01Ensure proper thread sealing.
- 02Suitable for low/medium pressure.
- 03Use locking compound if vibrating.
- 04Verify material compatibility.
What are branch connection (olet) fittings?
Olet-type branch connection fittings are forged components that create a reinforced branch outlet from a run pipe without using a tee. Made to MSS SP-97, the most common types are the weldolet (butt-weld), sockolet (socket-weld) and threadolet (threaded). They are used from 1/2" to 24" under the ASME B31.1/B31.3 piping codes.
Olet types: weldolet, sockolet, threadolet, latrolet, elbolet
An olet body is integrally reinforced: its own wall section compensates the opening cut into the run pipe, so no reinforcing pad is needed. The type follows the branch pipe connection: the weldolet takes butt-welded larger branches; the sockolet (socket-weld) and threadolet (threaded) serve small branches, typically below 2". The latrolet makes a 45° lateral branch and the elbolet takes a branch off an elbow. For branches much smaller than the run — say a 1" outlet on an 8" line — an olet is faster and more economical than a reducing tee: the run stays uncut and one weld gives a reinforced outlet. Materials: forged carbon steel A105N, A350 LF2 for low temperature, A182 F304/F316 for stainless. Delivered with 3.1 certificates.
Frequently Asked Questions
Weldolet vs sockolet vs threadolet — what is the difference?+
The branch pipe connection: a weldolet is butt-welded (larger branches); a sockolet is socket-welded and a threadolet threaded (both typically for branches below 2").
When is an olet preferred over a reducing tee?+
When the branch is much smaller than the run (e.g. a 1" outlet on an 8" line): the run pipe stays uncut and a single weld gives a reinforced outlet, whereas a tee needs two run welds.
What are elbolets and latrolets for?+
A latrolet takes a 45° lateral branch off the run; an elbolet sits on the back of an elbow, usually for drain, vent or instrument connections.
Which standards cover olet fittings?+
Dimensions per MSS SP-97; branch end details per ASME B16.11 (socket/threaded) or B16.25 (weld bevel); system design follows the ASME B31.1/B31.3 piping codes.
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