Reducing Couplings
A reducing coupling joins two grooved pipes of different diameters directly, without a separate reducer. One housing carries two groove sizes and a single gasket seals both pipes.
It cuts the part count and assembly length at transitions from sprinkler mains to branches and in tight pump rooms. Size combinations depend on the manufacturer’s series; just send us your line sizes.
Main Applications
- Size transitions from sprinkler mains to branches
- Tight pump room connections
- Stepped size reduction on risers
- Size changes on cooling water lines
Technical Data
| Connection | Grooved, two different sizes |
|---|---|
| Size combination | By model (please ask) |
| Housing | Ductile iron GGG 40.3 (manufacturer data) |
| Gasket | EPDM, −34 °C … +150 °C (manufacturer catalogue) |
| Bolts and nuts | Galvanized carbon steel (manufacturer data) |
| Flow direction | Usable in both directions |
| Working pressure | By model and pipe wall thickness |
| Alternative | Coupling + concentric reducer for the same transition |
Material Options
| Part | Reducing coupling |
|---|---|
| Housing | Ductile iron GGG 40.3 |
| Gasket | EPDM, stepped profile (by model) |
| Bolts and nuts | Galvanized carbon steel |
| Finish | Painted (by model) |
Which material? When this type is not in stock, the same transition can be made with a rigid coupling and a grooved concentric reducer; ask us about the size combination.
Advantages
Fewer Parts
- Coupling and reducer in one housing
Short Assembly Length
- Saves space in tight areas
Single Gasket
- Both pipes sealed by one gasket
Quick Installation
- Direct transition with no extra part
Construction and Design Features
- Ductile iron housing machined for two groove sizes
- EPDM gasket with stepped inner profile
- Galvanized bolts and nuts
- Housing length that varies with the size difference
Tell us the larger and smaller pipe sizes; we will offer a reducing coupling or an alternative solution.
How to Choose?
- Define the size pairWrite the large and small pipe sizes separately.
- Assess the spacePrefer a reducing coupling where assembly length is limited.
- Compare the alternativeIf not in stock, use a coupling plus concentric reducer.
- Select the gasketConfirm the EPDM gasket for water lines.
Complementary Products
Why ORFA?
Other Grooved Pipe Fittings
Threaded Mechanical Tees
Threaded mechanical tees are used to take a threaded branch off a pipeline without welding.
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U-Bolt Mechanical Tees
U-bolt mechanical tees are fixed to the pipe with a U-bolt and give a branch without welding.
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Grooved 45° Elbows
Grooved 45° elbows change direction by 45 degrees on grooved pipelines and are joined with couplings.
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Grooved 90° Elbows
Grooved 90° elbows change direction by 90 degrees on grooved pipelines and are joined with couplings.
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Grooved Flexible Couplings
Grooved flexible couplings join grooved pipes while allowing some angular movement and vibration.
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Grooved Equal Tees
Grooved equal tees split flow in three directions of the same size on grooved pipelines.
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Grooved Flanges
Grooved flanges connect a grooved pipe end to a flanged valve or piece of equipment.
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Grooved Flange Adaptors
Grooved flange adaptors move a grooved pipeline to a flanged connection.
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Grooved Crosses
Grooved crosses split flow in four directions on grooved pipelines.
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Grooved Caps
Grooved caps close the end of a grooved pipe and are joined with a coupling.
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Grooved Concentric Reducers
Grooved concentric reducers change pipe size on grooved lines along the same centre line.
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Grooved x Threaded Concentric Reducers
Grooved x threaded concentric reducers have one grooved end and one threaded end and change pipe size.
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Grooved Mechanical Tees
Grooved mechanical tees give a grooved branch through a hole cut in the pipe, without welding.
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Grooved Rigid Couplings
Grooved rigid couplings join grooved pipes with a fixed, solid connection.
Details →Get a quote for your project
Our sales team will prepare the best solution for your needs.