System 1 D-clamps are machined from 6061-T6 billet aluminum and available to secure 2” or 2-1/4” diameter filters. The D-clamps for the 2” diameter filters have two 1/4-20 holes spaced 2-5/8” apart and the larger clamps for 2-1/4” filters have holes spaced 2-3/4” apart.
