Feature●Perlage Filling Disk has a conical indentation to create gas-tight seal with the rubber tip of the pressurizer during pressurization of the Champagne bottle.●Perlage Filling Disk also creates seal with Perlage Universal Valve to prevent loss of CO2 during filling, and protects valve during tightening of cap.Description Red Perlage disk that fits into the Perlage cap.