The EVR CPI-IN In-line Rubber Duckbill Check Valve is a compact, high-performance valve designed for direct insertion into pipelines. It delivers reliable, silent, and maintenance-free backflow prevention in pressurized systems without the use of mechanical parts. Its streamlined design enables easy integration into pipe runs while offering consistent performance in handling abrasive, corrosive, or debris-laden flow media.
Compact, in-line design
Silent, leak-free backflow prevention
Withstands abrasive flow media
DN 50 to DN 900 (2” to 36”)
High-grade elastomers (EPDM, Neoprene, Nitrile, Natural Rubber)
Horizontal or vertical
Tight shut-off without reverse flow
Slip-in, clamped, or glued into pipe ends
Up to 6 bar
Zero maintenance required
As low as 25 mm H₂O (customizable)
Municipal water systems
Industrial effluent lines
Drainage and stormwater pipes
Chemical process pipelines
Irrigation and agriculture lines
Potable and raw water
Process water with particulates
Wastewater and stormwater
Chemical fluids
Seawater and brine
Compact footprint ideal for confined spaces
Opens under minimal pressure
Prevents water hammer and backflow surges
Customizable elastomer materials for fluid compatibility
Pipe clamps or mounting sleeves
Pressure monitoring ports
Protective inner linings
Customized sizes and elastomer formulations
From forging and casting to machining, assembly, and testing — every step is managed under one roof to ensure consistent quality, faster lead times, and zero compromise.
Get in touch with our team for additional information on product pricing, technical data, project support and more.
