Cut/ Un-Cut Type Back-Up Ring is concave on one side to better accommodate the O-Ring and retain shape under high pulsating pressure. The Back-Up Ring is available in cut or uncut designs in polytetrafluoroethylene, turcon and polymeric materials. The Back-Up Ring is strong and rigid in construction and requires minimal maintenance. Cut/ Un-Cut Type Back-Up Ring can be custom made in different grades and dimensions as per specific requirements.