Maruti Techno Rubber Pvt. Ltd. Manufactures Copper/Metal Water Stop Seal. Maruti Techno Rubber Pvt. Ltd. Is an ISO 9001:2000 certified company. Maruti Techno Rubber Pvt. Ltd. Offers rubber sealant and water sealing solutions. The Copper/Metal Water Stop Seal is used for heavy structures, where joints are to be extra-ordinarily protected. Due to its ductile nature copper is the most suited material for this purpose.