O-Ring and Seal Specialist. Our inventory of O-Rings and Seals is one of the largest in the world. Need help from an expert to select the best value FFKM Kalrez® O-Rings, High Temperature O-Rings, FKM Viton® O-Rings or Custom O-ring material for your application? High performance O-Rings and Seals can differentiate your product from the competition. Our engineering and service team is the most experienced and responsive in the industry. We appreciate the opportunity to prove it.