Mouth and topping-off valve
Also: nozzle, topping-off valve
A small mouth or topping-off valve lets you top up by mouth, for example when the boat softens in cold water.
Seats, backrests and mats have such valves too. A simple inflation hose from the hardware store makes topping up more comfortable without contorting yourself.
Matching gear
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Mouth/topping-off valve (spare)* (advertising, external link, opens in a new window)
Sources and further reading
Research as of 13 Nov 2026. We have marked manufacturer information as such.