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cold feed to a wc macerator, what service valve?

Discuss cold feed to a wc macerator, what service valve? in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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NYKLEE

I got this question in an exam. The possible answers were, stop valve, full way gate valve, single check valve or wheel head valve. Any idea as I cant find the answer anywhere?
 
There is no cold feed to a macerator. Maybe they mean the single check valve on the outlet to prevent backflow of nasties into the unit?
 
Yeah, I cant remember the actual wording of the question or where the valve was placed but I thought it was the single check valve due to possibility of contamination. Thanks.
 
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