Our field-proven Grayloc® clamp connectors have been used in a wide range of industries since the 1950s. Grayloc® Clamp Connectors are lighter, smaller, faster to make and break and easier to maintain than conventional pipe flanges. Best of all they don’t leak. Heritage brand Reflange range of products are available by Grayloc. Grayloc® remotely operated connectors are used in hazardous environments, personnel restricted areas, and automated operations. Grayloc compact flanges (GCFs) incorporate our proven metal-to-metal technology into a bolted flange design. Including the Grayloc seal ring in a compact flange design provides a solution with significant space and weight savings that outperforms conventional flanges. Grayloc Non-Slam Nozzle Check Valves.