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2 inch x 1-1/2 inch BSP black malleable iron hex bush.
Male 2 inch BSP thread to female 1-1/2 inch BSP thread.
Black malleable iron plumbing fittings are used for gas / air / oil /sprinkler / heating applications. They are NOT used for fresh water.
** BSP thread sizes are measured a special way - have a look at our information page for more details **
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