Get the 3/4" Compression Brass Coupling at your local Home Hardware store. View online and pick-up in store.
These fitting are very nice to have, GREAT for water repairs. They are a little pricey, but well worth the money. I've learn to call them Ford Fittings through my experience. Although
Cambridge Brass - Waterworks Brass Manufacturers
Type: Compression Union Tube Size:3/4 OD Net Weight: 140g/PC Choosing products dimensions and quantities at column of size and colour
LTWFITTING 3/4-Inch OD Compression Union,Brass Compression Fitting(Pack of 3)
Cambridge Brass - Waterworks Brass Manufacturers
3/4 Compression x 3/4 FPT Brass Adapter
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Cambridge Brass - Waterworks Brass Manufacturers