Diamond Plastics Corporation. Diamond Lok-21® restrained joint PVC pressure pipe is manufactured in accordance with AWWA C900 in sizes 4" through 12" to a DR18 with a pressure rating of 235 psi (1,620 kpa) and to a DR14 with a pressure rating of 315 psirn(2,160 kpa). Diamond Lok-21® pushes together like standard gasketed PVC pipe. The restraint mechanism is lodged in the bell. It does not require special tools, machines, special parts, or special training.
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