| http://www.w3.org/ns/prov#value | - The side walls 92 a are preferably formed from a conventional material such as aluminum or stainless steel, while the annular liquid drainage bowl 90 composed of outer wall section 92 b and inner section 122, is preferably made from a chemical resistant fluoropolymer such as PVDF (polyvinylidene fluoride), teflon (TFE, PFA, FEP), teflon NXT, Halar (ECTFE), or Kel-F (PCTFE).
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