Stainless Steel 4040 RO Membrane Housing

A professional-grade stainless steel pressure vessel designed to house standard 4040 format reverse osmosis membranes. Built for durability, precision, and long service life in demanding water treatment environments.

Unlike plastic housings, stainless steel is resistant to corrosion, tolerates higher pressures, and will not degrade with exposure to aggressive water chemistries — making it the preferred choice for serious koi pond RO systems, commercial installations, and anywhere long-term reliability matters.

Key Features:

•     Fits standard 4040 format RO membranes (4" diameter × 40" length)

•     Marine-grade stainless steel construction — corrosion resistant and 300psi pressure rated

•     Clean, hygienic internal surfaces — no plastic taste or chemical leaching

•     Suitable for high-pressure and high-volume RO applications

•     Professional end caps with standard port fittings

•     Compatible with the XLE 4040 and other 4040 membranes

📋 How to use: This housing is also available bundled with the XLE 4040 membrane — see our bundle listing for a saving.