Often the question arises: should a rain chain be hung with the hanging hook or the gutter installation piece (a.k.a. "gutter reducer"). The answer depends on the situation.
First of all, it should be noted that all of our chains come with a stock hanging hook included in the price of the chain, however the gutter installation piece is sold separately. With that said, some gutters already have a leader which protrudes out through the bottom of the gutter hole, which can serve to focus the water stream to the top of the chain for maximum conveyance. If the leader looks good, then there may not be a need for a gutter installation piece. The exception to this is if you are connecting additional length to the chain that will add substantial weight to the entire assemblage - in this case, the extra strength that the bolt in the gutter installation piece provides may be more desirable.
If however the gutter does not have a leader, or one that looks good, then the gutter installation piece will probably be the way to go. What's more is that the piece is made of copper and is styled to match the chains, so this can add to the overall visual appeal of the installation.
The important thing to keep in mind when installing a rain chain (apart from cost considerations) is what will optimize both the functionality and the overall look of the installation.