RO Membrane Housing 4021

1. What is the difference between a 4021 and 4040 membrane housing?

Both share the same 4-inch diameter, but the 4021 is a shorter housing length than the standard 4040. Always match the exact housing length to your membrane element's length, not just the diameter.

2. What size membrane does this housing fit?

4021-format membrane elements — confirm your membrane's exact length before ordering, since a 4040-length element will not fit correctly.

3. What is the maximum operating pressure of this housing?

300 PSI.

4. What material is this housing made from?

FRP (Fiberglass Reinforced Plastic), coated with polyurethane paint for UV resistance and durability.

5. Does this housing come with mounting hardware?

Yes — saddle and stainless steel straps are included with all models.

6. What's the difference between End Port and Side Port models?

The difference is where the permeate outlet is positioned, affecting how the housing integrates with your existing pipe layout. Confirm which your system requires before ordering.

7. Why choose a 4021 over a standard 4040 housing?

Primarily installation space — if your system has a shorter available mounting length, or your existing membrane element is 4021-length rather than 4040-length, this is the correct match rather than a downgrade.