This product acts as a full-bore and is a suitable replacement to the common cast iron full-bore that has traditionally been installed on flat concrete roofs to drain rainwater. The HyDrain 2nd Fix consists of a domed grate with a flange that is held together by 4 x bolts & nuts. The HyDrain 2nd Fix can be installed either in conjunction with or without it's 1st Fix counterpart.
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