Yes that's it, make sure they give you 1 each time.
I have the Brass & rubber 1 that comes with the Carbon Doser that can be used multiple times.
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250 gallon mixed reef, 2 Reefbreeder's Photon V 2, Deepwater BLDC 12, DAS EX-3 Skimmer, MTC mini cal, 2-3/4" Sea Swirls, Aquacontroller & 6 Tunze pumps.
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