The Pentek 154515 1-inch Black Cap attaches to the 10-inch or 20-inch PBH housing sump. It is made of durable polypropylene, and can be used in the unlikely event of damage to your filter system's current cap. Replace your broken cap without having to order a whole new system. 

Features:

• 1-inch NPT inlet and outlet ports for a tight fit with your existing plumbing
  
• 1/4-inch vent easily allows for release of trapped air before opening the outlet valve
  
• Made of high-flow polypropylene
  
• Maximize your investment by protecting your cap and sump against freezing
  
• Genuine OEM Product