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The end cap that closes the bottom of the titanium heat exchanger housing in a TK series chiller. Replaced when the plastic has crazed or the sealing face has been damaged and the exchanger weeps at the base.
Fit it with a new silicone O-ring rather than reusing the old one — a cap that seals on an aged O-ring will usually weep again within a season.
Teco is made in Italy and its spare parts are model-specific — check the model plate on the back of your unit before ordering. See the full Teco range, including the Teco TK aquarium chillers themselves.