on my vermont castings dv30 gas direct vent heater(new to me), the manual states that when attaching the inner adapter pipe of the coaxial system to the firebox, i should "run a bead of sealant" at the attachment point -- i'm not clear as to whether they mean the rutland 600 degree silicone sealant(flexible), or the 2000 degree cement(not flexible, with silica)?
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