This is for a FRP top opening reducer adaptor for fibre glass vessel - 4" to 2.5". Please click here to view our fibre glass vessels.

Overview

The ADAP-4-2.5 adapter is a precision-molded reducer designed to convert a 4" threaded opening on an FRP (Fiberglass Reinforced Plastic) pressure vessel to a 2.5" threaded port, allowing for secure connection of standard filtration control valves. It ensures a tight, leak-free seal and is ideal for water softeners, filtration tanks, and reverse osmosis systems.

Key Features

• Reduces 4" FRP vessel thread to 2.5"

• Enables installation of 2.5" control valves on larger FRP tanks

• Quick and easy installation with standard threading

• Durable, corrosion-resistant construction

• Perfect for new installations and retrofitting existing tanks

Technical Specifications

• Model: ADAP-4-2.5

• Thread Size: 4" male (outer) to 2.5" female (inner)

• Material: High-strength reinforced plastic or polypropylene

• Pressure Rating: Suitable for typical filtration and RO systems

• Application: FRP vessel thread reduction for control valves and fittings

Applications

• FRP filter vessels in RO systems

• Industrial and residential water treatment systems

• Converting 4" top openings to 2.5" valve-compatible threads

• System upgrades and component replacements

Why Use the ADAP-4-2.5 Adapter

• Allows flexible valve and component compatibility

• Prevents leaks with precise, tight-fitting threads

• Reduces the need to replace entire vessels

• Saves cost and simplifies installation

• Trusted by Pure Water 4 Life for tank-to-valve conversions