Source for replacement one-way "duckbill" valve for waste outlert

Following my tackling the whiff from the kitchen sink, the silicone insert non-return/one-way valve is fucked.
Does anyone know if it's possible to buy just the valve, without the
containing pipe ?
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On 17/05/2020 13:20, Jethro_uk wrote:

Not something you normally see in the UK (water traps being preferred), so no, not seen any.
--
Cheers,

John.
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