Push-fit fittings are a new generation of in-building wastewater and drainage systems made of polypropylene (PP)—a lightweight polymer, resistant to impact and chemicals, with a service life exceeding five decades. The socket–O-ring technology turns installation into a simple “push and done” operation; joints are fully sealed within seconds without glue, welding, or flame. Beyond easy execution, push-fit is certified to the European standard EN 1451 for continuous temperatures up to 95 °C and transient 98 °C, and in the EN 14366 acoustic test it reduces flow noise to about 15 dB—figures that ensure acoustic comfort in high-end residential spaces.
Standards and Size Ranges
The bodies and sockets of all push-fit components comply with EN 1451-1 requirements. The table below shows the most common outside diameters and wall thicknesses:
| Outside diameter (mm) | Wall thickness (mm) |
|---|---|
| 32 | 3.0 |
| 40 | 3.0 |
| 50 | 3.0 |
| 63 | 3.0 |
| 75 | 3.0 |
| 90 | 3.4 |
| 110 | 3.4 |
| 125 | 3.9 |
| 160 | 4.9 |
| 200 | 6.2 |
Key Advantages
- Installation speed: each joint is completed in under ten seconds; in high-rise projects this can cut installation time by up to 60%.
- Secure sealing: the EPDM O-ring inside the socket guarantees zero leakage under both negative and positive pressure.
- Thermal performance: continuous durability up to 95 °C makes it compatible with hot greywater, kitchen effluent, and laboratory discharge.
- Noise reduction: a triple-layer structure and higher wall density reduce flow noise to below 20 dB at 2 L/s.
- Seismic resistance: 5% axial flexibility and weld-free joints eliminate the risk of brittle failure in earthquakes.
- Chemical stability: inert to pH 2–12 and most solvents.
Range of Fittings
- Equal and reducing couplers
- Elbows: 45°, 67°, 87° (90°) for gentle or sharp changes of direction
- Tees: equal and reducing for horizontal or vertical branching
- 67° crosses for collecting multiple horizontal lines into a vertical stack
- U- and P-traps with access caps
- Threaded cleanouts up to 160 mm diameter
- Integrated floor drains with automatic conversion to push-fit
- Double-socket repair couplers, and end caps for temporarily blanking an active line
Installation
- Cut the pipe perpendicular to the axis and deburr; chamfer 15° using a conical bit or beveler.
- Apply silicone lubricant only to the male spigot, then insert into the socket to the depth mark.
- Use sliding clamps at intervals of 10× pipe diameter on horizontal runs and 15× diameter on verticals.
- On tall risers, install one fixed (static) clamp every three floors to manage linear expansion..
Complementary Products
Silent metal clamps, elastomeric insulation tape (for sound and condensation reduction), spare EPDM O-rings, and cleanouts with inner plug are essential accessories to complete a push-fit network. Using a homogeneous material family (PP) maximizes system service life.
Technical Comparison with Common Options
| Feature | Push-fit PP | Wastewater polyethylene | PVC-U |
|---|---|---|---|
| Sealing | O-ring, IP68 rating | Extrusion weld | Solvent cement |
| Impact resistance (0 °C) | Good | Excellent | Weak |
| Thermal resistance | 95 °C | 60 °C | < 60 °C |
| UV durability | Medium (strong in black layer) | Weak | Weak |
| Installation time | Very fast | Medium | Slow |
| Initial cost | Medium | High | Low |
Brand Selection Criteria
When evaluating brands, pay special attention to EN 1451 test certification, actual wall thickness, O-ring material (genuine EPDM), internal smoothness ≤ 0.2 µm, and the presence of a fire rating (B2 or better). Manufacturers that offer triple-layer acoustic lines and pre-insulated risers have a clear edge in hotel and hospital projects.
Applications
- Gravity and vacuum sewage systems in towers, malls, chemical laboratories, and food industry facilities
- Drainage of inverted roofs, terraces, and green roofs with high-flow outlets
- Vent lines, dry emergency risers, and stormwater discharge in basements
Tamambaha Online Store, as one of Iran’s reputable suppliers of push-fit fittings, offers a complete range of PP pipes and accessories in 32–160 mm with a guarantee of authenticity and, through a nationwide network in Iran, provides fast dispatch to construction and industrial sites. To preserve customer choice, it also highlights other compliant brands
