Two styles are available to accommodate either left-side or right-side inlets for AN-8, AN-10 or AN-12 lines. They are CNC machined from 6061-T6 billet aluminum and black anodized (no red available). Accommodates System 1’s 3-3/4” and 4” diameter filters with 1” -12 threads —no threaded adapters needed. Mounting holes are 5/16 on 2” center.