MPTFE (MODIFIED POLYTETRAFLUOROETHYLENE)DIAPHRAGM- INTERNAL COMPONENT PART OF A WEIR DIAPHRAGM VALVE. THE DIAPHRAGM SITS IN A GROOVE ON THE VALVE BODY AND THE TOP WORKS IS PLACED ON TOP. THE VALVE BODY AND TOP WORKS ARE THEN CLAMPED TOGETHER. THE DIAPHRAGM FORMS A SEAL WITHIN THE VALVE TO CONTROL THE FLOW OF MEDIA.

GIR’s 1 & 6 The Harmonised System Explanatory Notes to 8481. The Text to Taric Code 8481 90 00 90 & Chapter XVI, Note 2 (b)