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Our couplings are made of graphite cast iron QT450-10, which is approximate to follow Asia Pacific Countries and main European countries.
with red color coated.
The size is from 2" to 8", according to both US and BS standard.
They are used in fire-fighting sprinkler system, can connect two pipes end by end.
They have been approved by FM , and will be listed by UL in couples of months.
They have been sold to all over the world.