Xit 404 Aperture Knob: Aquatica SLR Housings

Xit 404 Aperture Knob: Aquatica SLR HousingsAn Aquatica Aperture Knob gives you the perfect control you need it. The Aperture Knob presses onto your existing knob, vinyl tape is included to ensure a snug fit. The focus knob is constructed of durable Red plastic.