1551V Snap-Fit Vented Enclosures Hammond Manufacturing 1551V Snap-Fit Vented Enclosures protect electronics from harmful contact while allowing entry of air and moisture for applications that require environmental exposure. The enclosure base features assembly hooks, wall-mounting slots, snap-fit closures, wire-entry knockouts, and PCB standoffs. The 1551V series is available in four sizes with three color options: black, gray, and white. Hammond Manufacturing 1551V Snap-Fit Vented Enclosures are ideally suited for PCBs.