4 inch End Cap for Membrane Housing– UKL

The 4 Inch End Cap for Membrane Housing by UKL is a high-quality, precision-molded component designed to ensure a secure and leak-proof seal for RO membrane housings. Made from durable, chemical-resistant materials, this end cap is built to withstand high-pressure water filtration systems, making it an ideal choice for both commercial and industrial RO applications. Its robust construction ensures long-term reliability and ease of installation.

Whether you're replacing an old cap or building a new filtration system, the UKL end cap offers the perfect fit and performance for 4-inch membrane housings. Trusted by professionals in the water treatment industry, this component supports high flow rates and delivers leak-free operation under demanding conditions.

• Precision-engineered for 4-inch RO membrane housings

• Leak-proof sealing with O-ring compatibility

• Strong chemical and pressure resistance

• Durable and long-lasting performance

• Easy installation and removal

• Trusted UKL brand quality

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.