The Groove is positioning and stabilizing the PTFE gasket for the exceptionally smooth sealing surface area. Combining the flat QVF SUPRA-flange with the normal GMP gasket results in the flange relationship which has a minimal useless House. Pipelines at an angle of roughly 5°can as a result be absolutely drained. https://angeloojbsk.amoblog.com/the-fact-about-glass-lined-reactor-suppliers-that-no-one-is-suggesting-51619228