attwood Blower H20 Resist (White, 4-Inch) Patented in-line design provides ventilation for engine compartments, galleys, bilges, and heads Install with no.10 fasteners, individual carton includes 2 tie straps All are CE certified 16-gauge tinned and caulked copper wire leads with optional MP1 molded rubber connectors Mounting feet allow vertical or horizontal installation in confined spaces