Dobuild Mcalpine Exta-F 4"/110Mm Adjustable Straight Extension

4"/110mm Outlet adjustable length straight extension piece for rigid WC connectors ,There is no British Standard for flexible WC connectors but McAlpine connectors comply to German Standard DIN 1389:2000-05 for flexible WC connectors ,Tested by German Testing House LGA,Certificate Number 0120208-02 and other Testing Houses.Tests prove conclusively that there is no build-up of sediment and the product is perfectly fit for purpose ,