PP Compression Reducing Coupler
PP compression reducing coupler is designed to connect two compatible plastic pipes of different outside diameters in a straight line using a mechanical compression joint. It is suitable for irrigation, water distribution, landscaping and other compatible piping systems requiring a simple size transition without fusion welding.

Material: Polypropylene (PP)
Jointing: Mechanical compression
Type: Straight reducing coupler
Largest Listed Size: 110 × 90 mm
Available Models: 30
All Models & Specifications
Available PP compression reducing coupler models are listed below. Dimensions are shown as larger pipe size × smaller pipe size.
| Size (mm) |
|---|
| 25 × 20 |
| 32 × 20 |
| 32 × 25 |
| 40 × 20 |
| 40 × 25 |
| 40 × 32 |
| 50 × 20 |
| 50 × 25 |
| 50 × 32 |
| 50 × 40 |
| 63 × 20 |
| 63 × 25 |
| 63 × 32 |
| 63 × 40 |
| 63 × 50 |
| 75 × 32 |
| 75 × 40 |
| 75 × 50 |
| 75 × 63 |
| 90 × 32 |
| 90 × 40 |
| 90 × 50 |
| 90 × 63 |
| 90 × 75 |
| 110 × 32 |
| 110 × 40 |
| 110 × 50 |
| 110 × 63 |
| 110 × 75 |
| 110 × 90 |
About PP Compression Reducing Coupler
The PP compression reducing coupler provides a straight transition between two pipes of different outside diameters. It is selected where the pipeline needs to change size while retaining a mechanical compression connection on both ends.
The larger size is listed first and the smaller size second. For example, 63 × 50 mm connects a 63 mm pipe to a 50 mm pipe. The fitting should be selected to match both connected pipe outside diameters.
About PP Compression Fittings
PP compression fittings are mechanical fittings commonly used in water distribution, agricultural irrigation, landscaping and compatible utility piping systems. Their compression-joint design allows installation without fusion welding equipment.
A typical PP compression fitting uses a body, compression nuts, gripping components and sealing elements to create a mechanical pipe connection. Product selection should consider pipe outside diameter, fitting type, operating conditions, fluid medium and project requirements.
Product Details
Overview
The PP compression reducing coupler combines a straight connection and a pipe-size transition in one mechanical fitting.
Product Features
- Polypropylene construction
- Mechanical compression connection
- Straight transition between different pipe diameters
- 30 listed size combinations
- No fusion welding equipment required for assembly
Applications & Installation
Typical Applications
Suitable for compatible water distribution, irrigation, landscaping, agricultural and utility piping systems where a straight reduction between two pipe sizes is required.
Installation
Cut both pipe ends square, clean the insertion areas and confirm the correct fitting orientation. Insert each pipe into the matching compression end and tighten the nuts according to the fitting installation procedure.
Ordering Information
- Required larger × smaller size
- Quantity for each model
- Project operating conditions if technical matching is required
- Delivery destination
Frequently Asked Questions
How should I specify the reducing coupler size?
Specify the larger pipe size first and the smaller pipe size second, for example 90 × 63 mm.
How many size combinations are listed?
There are 30 listed size combinations on this page.
Is fusion welding equipment required?
No fusion welding equipment is required for the compression assembly itself. Installation should follow the procedure specified for the selected pipe and fitting system.
International Buyer & Sourcing Information
PP compression reducing couplers are used where compatible plastic pipes of different outside diameters need to be joined with mechanical compression connections. They are relevant to water, irrigation and utility-piping distributors and wholesalers sourcing mixed-size fitting inventories.
Need PP compression reducing couplers?
Send us your required size combinations and quantities for quotation and lead-time confirmation.
Related Products
PP Compression Coupler
Straight equal-size compression fitting for compatible plastic pipes.
PP Compression Male Threaded Adapter
Compression adapter with a male threaded transition connection.
PP Compression 90° Elbow
Compression elbow for 90-degree pipeline direction changes.


