12″ Stainless Steel False Bottom – $32.99 12″ Stainless False Bottom. Domed shape allows to use in any container larger than 12″. An exact fit is not necessary. 3/8″ bar for use with 3/8″ ID Tubing (usually high temp). Use in your mash tun or brew kettle. 840836 – False Bottom 12″ – Stainless – $32.99