4-inch end-joined fiberglass reinforced plastic (FRP) RO membrane housing is made of high-performance glass fiber reinforced plastic (FRP), featuring an extremely compact structure and outstanding pressure resistance and corrosion resistance. Its unique end-port design integrates the inlet and outlet water interfaces completely at both ends of the membrane housing, resulting in an extremely regular and compact structural layout. Compared to the side-joined design, it can significantly optimize the internal space of the equipment and simplify the installation of pipelines. The housing can stably withstand working pressures ranging from the conventional 300 PSI to the industrial-grade 1200 PSI, and is compatible with 1 to 4 standard 4-inch reverse osmosis membrane elements. It is an ideal pressure vessel solution for commercial direct drinking water systems, food and beverage processing, small-scale industrial desalination, and other high-standard fluid separation applications.
End Connection (E) – All interfaces are located at both ends of the container.
Number of compatible membrane elements
Winder® Brand: 1 to 4 pieces
Cheng Hang Brand: 1 to 2 pieces
Design pressure rating
300, 450, 600, 1000, 1200 PSI (pounds per square inch)
Main shell material
Glass Fiber Reinforced Plastic (FRP)
End plate / interface accessory material
Stainless steel / alloy
Main application fields
Commercial and small-scale industrial reverse osmosis (RO) systems
【Product Overview】
This series consists of 4-inch glass fiber reinforced plastic (FRP) reverse osmosis membrane shells, which are the core pressure vessel components of commercial and small-scale industrial reverse osmosis (RO) systems. The product line is complete, covering three connection types: end port, side port, and quick detachable. This design meets the requirements of different system layouts and maintenance needs. Made of high-strength fiberglass material, it offers a wide range of pressure grades from 300 PSI to 1200 PSI, and can accommodate 1 to 4 standard 4-inch membrane elements. It features excellent pressure resistance, corrosion resistance, and high cost-effectiveness, making it a reliable choice for medium-sized water treatment projects.
【Product Features and Advantages】
Full range of types, customizable selection: Offer end connection, side connection, and quick disassembly designs, perfectly adapting to various system layouts ranging from standardization to high maintenance requirements.
Wide pressure range, widely applicable: The pressure rating covers 300 to 1200 PSI, capable of meeting the needs of conventional brackish water desalination as well as handling some high-pressure application scenarios.
Maintenance convenience (quick disassembly type): The quick disassembly design makes the inspection, cleaning and replacement of membrane elements extremely simple, significantly saving maintenance time and labor costs.
High cost-effectiveness: While ensuring the corrosion resistance and long lifespan of the fiberglass material, we offer a cost solution that is competitive in the market.
Sturdy and reliable: The FRP shell boasts outstanding compressive strength and chemical corrosion resistance, ensuring the safety and stability of the pressure vessel during long-term operation.
【Typical Application Scenarios】
Direct drinking water reverse osmosis systems for commercial buildings, schools and hospitals
Processing water preparation for the food and beverage industry
Pre-treatment of ultra-pure water for small-scale electronics and electroplating industries
Small-scale seawater desalination equipment
Water treatment for packaging water and beverage filling lines
