Blog T57 in a new form for small nominal diameters Article T57 in a new form for small nominal diameters By I.S.T. Molchtechnik GmbH on 01.09.2014 Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Share on Telegram Share via Email Share link Check icon Close The full system manifold T57 has proven itself over many years on the market. In the new variant of piggable manifold is now available for the nominal diameter DN 25 / 2" available.