This is a HF5-4040 RO Membrane Replacement Axeon HF5-4040 – 2500 GPD, 98.5% Salt Reject.  It is new in box.  Free shipping from US seller.

Rated at 2,500 gallons per day with 98.50% stabilized salt rejection. Optimal operating pressure: 80 psi; maximum operating pressure: 400 psi. Maximum operating temperature: 113°F. Maximum feed flow rate: 6 gpm. Continuous operation pH ranxge: 2–11; short-term cleaning (30 minutes) pH range: 1–13. Maximum SDI: 5. Salt connection:1000-2000 ppm

Food-Grade Materials – Manufactured using BPA-free materials for the filter housing and components. The production facility is ISO 9001 certified, with quality control processes in place to meet customer requirements