4 inch End Cap for Membrane Housing– UKL

1. What size housing does this end cap fit?

4-inch diameter membrane housings — compatible with both the 4040 and 4021 UKL housing formats.

2. Will this fit an 8-inch housing?

No — for 8-inch (8040) housings, you need the 8 Inch End Cap instead.

3. What is the seal type on this end cap?

An O-ring groove design for a leak-proof fit — ensure you're using a correctly sized, undamaged O-ring for a secure seal.

4. What temperature range can this end cap handle?

5°C to 45°C, suitable for standard commercial and industrial RO operating conditions.

5. Do I need to replace the whole housing if my end cap is leaking?

Not necessarily — if the housing body itself is undamaged and the leak is isolated to the cap seal, replacing just the end cap is usually the more cost-effective repair.

6. Is this compatible with non-UKL housings?

This end cap is designed and sized for UKL's 4-inch housing range. If you have a different manufacturer's housing, confirm exact port and thread compatibility before ordering, or contact Pearl Water's support team.

7. Is installation difficult?

No — it's designed for easy installation and removal, the same as the original end cap on your housing.