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Oct 23, 2025 - 08:26 PM
We’ve provided several answers to questions related to ProTool RO Membrane 4040 Ultra Low Pressure , see some other helpful Q&A related to this product.
Question: Original dual 4040 ROs that came with my system are HEX-shaped inside the nipples, vs round/circular.
Answer: Having the hex inside the tube or being smooth inside the tube will not impact the use or fitment of the RO membrane..
The original ROs you have came from a different factory,
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