Plasson reducing bushes provide a simple way to adapt the bore size when connecting pipes, imperial in size with a BSP thread and made of Polypropylene which is an ideal replacement for gunmetal or bronze as it will not corrode. Material approved by WRAS. Made from Polyproplene so will not corrode. BSP Threaded. Fast and simple to install. Rated 16 bar. 0. 0. 0