Brass Square Head Drain Bung and Socket A solid brass 3 hole fixing drain socket with a tapered thread square head brass plug. Cut out hole : 29mm Fixings : 3 x 4mm countersunk on 40mm PCD Overall diameter : 55.5mm Bung square :14mm This item uses a 1/2" BSP thread, which has an internal diameter of around 19mm.
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