The retainer for the ball check valve is a small keg coupler part that you'll want a spare of - it's small enough that you may lose it but vitally important to pouring your beer correctly.

This check ball valve, or check ball retainer, fits a standard "D" system Sankey keg coupler. It sits above the check ball (an actual little ball) and holds it in place inside the coupler. These valuable draft beer parts allow proper flow through your system by preventing back flow after the beer has left the coupler.

Keep these important keg coupler parts on hand, so if an unexpected issue arises, you'll be ready.

• Fits with Sankey D keg couplers
• Keeps the check valve in place
• Helps to prevent back flow after beer has left the coupler
• Great to keep on hand for unexpected repairs