Silicon Made Four Lobbed Seal similar like O rings are used on piston and rod in combination with backup rings to withstand pressure up to 400 bars. Silicon Made Four Lobbed Seal is manufactured by Fitco Engineers Pvt Ltd which is an ISO 9001:2000 certified company. The Company also manufactures various types of seals. The Silicon Made Four Lobbed Seal, also known as Quad Ring, has minimal leakage as the contact pressure is evenly distributed. This Seal is also made of vitron, nitrile etc.