1 inch Push x 3/4 inch FIP Push-Fit Female Adapter, Push to Connect, Push x FIP(Click in for more size options), 1'' Push x 3/4'' FIP, Fits copper

LF Instant Push-Fit connection, no soldering, clamps, unions, or glue required.

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SharkBite 1 in. Push-to-Connect x FIP Brass Adapter Fitting U094LFA - The Home Depot

The Plumber's Choice 1/2 in. x 3/4 in. Push to Connect Push x Female Adapter, for PEX, Copper and CPVC Piping 1234UPFC - The Home Depot

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Max Brass Female Adapter

SharkBite 3/8-in OD Push-to-Connect x 1/4-in FIP Female Adapter in the Push to Connect Fittings department at

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Max Brass Push Corrugated Water Heater Connector

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Threaded Pipe Adapter

UV Water Filter Sterilizer Purifier for Whole House Ultraviolet