This durable polypropylene replacement cap is designed for Big Blue filter housings, featuring a 1-1/4-inch internal port for high-flow liquid passage. The integrated red pressure release button simplifies filter changes, making it a versatile solution for systems like the HD-950 and 20-BB.

• High-flow polypropylene construction allows for rapid liquid passage through the 1-1/4-inch internal port.
• Integrated red pressure release button makes filter changes easier and safer.
• Designed with 1 in. NPT inlet and outlet ports to ensure a tight fit with existing plumbing.
• Versatile replacement part compatible with various systems including HD-950, 20-BB, W10-PR, and W2010-PR.
• Protects your investment by helping to safeguard your cap and sump against freezing.