Flip Lock Drain Plug 1" Stainless from SEAFIT DRAIN
Standard rubber and brass plug fits 1" transom drains on many production boats.

1'' Transom Drain W/Plug from BECKSON MARINE INC
All-nylon drain and plug with a plastic retainer and O-ring.

Transom Drain Tube - 1 x 3" from SEAFIT DRAIN
Corrosion resistant brass.

Transom Drain Tube & Plug from MOELLER
This nylon drain tube won't rot, bend or mildew, fits flush to your transom, and allows water to drain when your vessel is trailered. A rubber O-ring makes a watertight seal. Can be loosened with a flat-head screwdriver. Fits 1 1/8'' openings. Mounted with rivets or #8 fasteners.

Electronic Horn, Black from AQUA-SIGNAL
This under-deck hidden horn is designed for vessels under 12 meters, draws less than 1/2 amp and is easily installed in a standard 2 1/4" cutout. Each unit is completely sealed and comes with a waterproof gasket. All openings are sealed to let sound out but prevent water from coming in. Loudness dB: 106-108dB. Design Standards: USCG, CE. Dimensions: 4. 92"L x 3. 11"W x 3. 43"D. Draw: Less than 0. 5A at 12V.

Stainless-Steel Compact Electric Horn - Double from AFI
Mini Twin Electric Horn Excellent for use in the marine environment. totally seal sound units have type 304 stainless cover, diaphragm and mounting brackets. Material: 304 stainless cover & horn diaphragm. Loudness dB: 106 dB. Approvals: ABYC for boats up to 20 meters. Dimensions: 3"L x 8"W x 1 3/4"H. Power Requirements: 12V. Draw: 3A @ 12V (max. 6A). Fundamental frequency: 490±20/440±20.