STRAUB OPEN-FLEX 1L 76.1mm 3″ 35251

Straub OPEN-FLEX 1L Pipe Coupling

Description

The Straub OPEN-FLEX 1L is a robust and flexible pipe coupling designed for joining plain-end pipes. Its unique hinged, split-casing design allows for fast and simple installation, especially in tight spaces or on existing pipe systems. This model is suitable for a wide range of applications in water treatment, shipbuilding, and industrial processing. Please note, this coupling is ‘not pull out resistant’ and requires pipes to be independently anchored.

Specifications

• Manufacturer: Straub (GF Piping Systems)
• Model: OPEN-FLEX 1L
• Part Number: 35251
• Outer Pipe Diameter: 76.1 mm / 3.0 inch
• Maximum Working Pressure: 16 bar / 232 psi
• Seal Material: EPDM
• Casing Material: Stainless Steel
• Required Tightening Torque: 10 Nm

Label Info

• Type: OPEN-FLEX 1L 76.1
• Part #: 35251
• DWG #: 4766
• Year / Serial #: 2010 / 056614130910

Application

Ideal for maintenance, repair, and new installations in water management, industrial plants, and construction where a reliable, non-restraining pipe connection is needed.

Country of Origin

Made in Switzerland.

CO2 Impact

Opting for this pre-owned coupling saves approximately 3.6 kg of CO2 compared to manufacturing a new one, contributing to a more sustainable industrial practice.

Availability

This item is in stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is the main advantage of the ‘OPEN-FLEX’ design?
The hinged, split-casing design allows the coupling to be opened completely and wrapped around the pipe joint. This makes installation significantly faster and easier, especially for repairs on existing pipelines, as the pipes do not need to be separated.

What does ‘not pull out resistant’ mean for this coupling?
This type of coupling creates a secure seal around the pipe joint but does not provide axial restraint. This means it will not prevent the pipes from pulling apart under pressure or thermal expansion. The piping system must have its own external anchoring and support to manage these forces.

What applications is the EPDM seal suitable for?
The EPDM (Ethylene Propylene Diene Monomer) rubber seal is highly resistant to water, wastewater, steam, air, and many diluted acids and alkalis. It is not suitable for applications involving hydrocarbons like oils, gasoline, or solvents.

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Friday, March 13, 2026