STRAUB OPEN-FLEX 1L 88.9mm 3.5″ 35350

Straub OPEN-FLEX 1L 35350 Pipe Coupling

Description

The Straub OPEN-FLEX 1L is a high-performance, hinged pipe coupling designed for quick and reliable installation on pipes with an outside diameter of 88.9 mm (3.5 inches). Its openable design makes it ideal for repairs or additions to existing pipe systems where dismantling is not feasible. This non-restraint coupling securely joins pipes while compensating for tolerances. Made in Switzerland, it represents the highest standards in quality and durability.

Specifications

• Manufacturer: Straub
• Model: OPEN-FLEX 1L
• Article Number: 35350
• Outer Diameter (OD): 88.9 mm / 3.5 inch
• Nominal Pressure (PN): 16 bar / 232 psi
• Test Pressure (PS): 24 bar / 348 psi
• Gasket Material: EPDM
• Casing and Bolt Material: W5 Stainless Steel (1.4404/316L)
• Tightening Torque: 10 Nm
• Type: Non-pull-out-resistant

Label Info

• Serial Number: 072359100512

Application

This coupling is perfectly suited for applications in water supply, wastewater treatment, industrial processing, shipbuilding, and construction. The EPDM gasket offers excellent resistance to water, ozone, and many chemicals.

Country of Origin

Made in Switzerland.

CO2 Impact

By purchasing this pre-owned component, you contribute to the circular economy and avoid the emission of approximately 4.0 kg of CO2, which is associated with the production of a new unit. This saving is comparable to the CO2 captured by a tree over several months.

Availability

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

FAQ

What does the ‘W5’ material designation mean for this Straub coupling?

W5 indicates the highest grade of stainless steel used by Straub. Both the casing and the bolts/screws are made from 1.4404 / 316L stainless steel, offering maximum corrosion resistance, making it suitable for demanding environments like marine or chemical applications.

Is this OPEN-FLEX 1L coupling pull-out resistant?

No, the label clearly states it is ‘not pull-out-resistant’. This means the coupling joins the pipes securely but does not provide axial restraint. The pipes must be independently anchored to prevent them from pulling apart due to pressure, temperature changes, or external forces.

What types of media is the EPDM gasket suitable for?

The EPDM (Ethylene Propylene Diene Monomer) gasket is primarily designed for water applications, including potable water, wastewater, and industrial water. It also has good resistance to many diluted acids, alkalis, and ketones. However, it is not recommended for use with mineral oils, fuels, or solvents.

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Friday, March 13, 2026