58 ID Silicon Rubber Rings for ETC Solar Water Heater Systems. These Rings are made from higher grade of Silicon which gives greater Tensile, Elongation, Compression set compared to Silicon Rings which have been imported in market. We also assure we we are the best at rates comparatively. We supply these Ringse all over India right from North, North-East, North-West, South, South-East and South-West where we are located. We have been in manufacturing for Solar Industry since 29 years following BIS Standards. TC can also be provided on request by the buyers from authorized Testing Facilities (NABL approved Labrotary). ETC Rings for Solar Water Heater Systems, 58 ID Silicon Rings for ETC Solar Water Heater Systems, ID 58 Silicon Rubber Rings for ETC Solar Water Heaters, 58 ID ETC Silicone Rings for Solar Water Heaters, ID 58 ETC Silicone Rings for Solar Water Heater, ETC Silicon Rings 58 ID for Solar Water Heater System