I wanted to know if the leak sentry device is necessary to have
installed for the operation of the Fluidmaster 400 LS. It broke off
while i was installing it. It looks like more of a water saving
feature.Will it still operate correctly without it connected? Thanks.

Yes it will work just fine, it is really a very hokky gimick that doesn't
even work for all tanks/values. I never install the LS part of the 400 LS.
In fact, I only buy the LS if they are out of the 400 when I hit the store.

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I wanted to know if the leak sentry device is necessary to have
installed for the operation of the Fluidmaster 400 LS. It broke off
while i was installing it. It looks like more of a water saving
feature.Will it still operate correctly without it connected? Thanks.