![Attwood Scupper Valve [3876-3] MerCruiser Parts > MerCruiser Exhaust > MerCruiser 4.3 Exhaust Parts > MerCruiser 4.3 Riser Elbows The regulations for AIS demand](https://cdn.shopify.com/s/files/1/0943/8652/0347/files/66237XL.jpg?v=1747255410)
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The regulations for AIS demand that the Class B transponder has to incorporate itsown GPS positioning receiver which normally involves fitting an external antenna
20 lbs per speaker
(Not to be considered or used as a hoist)
resulting in cooler operation
which can save thousands of dollars in fuel operating cost
Attwood Scupper Valve [3876-3] MerCruiser Parts > MerCruiser Exhaust > MerCruiser 4.3 Exhaust Parts > MerCruiser 4.3 Riser Elbows The regulations for AIS demandScupper Valve Provides a water exit for boats with self bailing cockpits. Acetal construction. Accommodates 3875B thru transom thru hull connector (screw holes must be drilled for installation.) Diameter: 2 7 8" Use as a replacement valve for 3881 Thru Transom Scupper Caution: Thru Hull connectors are designed for installation above the water line only. WARNING: This product can expose you to chemicals which are known to the State of California to
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