Made from a proprietary material, the Clear-100™ Plunger Seals feature an internal spring that provides the correct pressure on the plunger, increasing the life of the sapphire and the seal itself. The Clear-100™ Seal features an exclusive ringed or ribbed design on the inside of the seal, which helps to maintain a snug fit and increases the seal’s durability. The Clear-100™ Seal is best suited to most applications for Waters® Solvent Delivery Systems. It is included in Performance Maintenance Kits.