
The FRP Tank 1865 Top Pentair is a durable, high-performance fiberglass-reinforced plastic (FRP) pressure vessel designed for industrial and commercial water treatment applications. Engineered with corrosion-resistant FRP material, it ensures long-lasting reliability and minimal maintenance even in harsh environments. The “Top” configuration provides easy access for inspection, media replacement, and maintenance, while its robust construction supports high pressure and temperature conditions. Compatible with Pentair systems, this tank is ideal for filtration, softening, and chemical processing applications. Lightweight yet strong, it combines efficiency, safety, and durability, making it a trusted choice for water purification and industrial fluid handling needs.
The Pentair 1865 Top Opening FRP (Fiberglass Reinforced Plastic) vessel is a high-performance pressure tank designed for residential and light commercial water treatment applications, including softening, filtration, and reverse osmosis systems.
Constructed using Structural PolyGlass™ technology, the vessel features a seamless inner polyethylene liner encapsulated by a continuous fiberglass outer shell reinforced with high-strength epoxy resin. This composite construction ensures exceptional durability, chemical resistance, and leak-proof performance, making it ideal for aggressive water treatment environments.
The vessel boasts a 250-liter (66.1-gallon) capacity, with a diameter of 473 mm and a height of 1640 mm without the base (1753 mm with base). It operates efficiently under pressures up to 150 PSI (10.34 bar) and temperatures up to 49°C, with a maximum vacuum rating of 127 mmHg.
Certified by NSF and CE, the Pentair 1865 FRP vessel meets international safety and quality standards, ensuring reliable and safe operation. Its lightweight design simplifies handling and installation, while its corrosion-resistant properties extend its service life. The vessel is backed by a 1-year warranty against manufacturing defects, providing added assurance to users.
In summary, the Pentair 1865 Top Opening FRP vessel offers a robust, reliable, and efficient solution for various water treatment needs, combining advanced materials and engineering to deliver long-lasting performance.

