Lowe's has a great selection of brass compression nuts. Available in a variety of sizes from Anderson Barrows. Some include the 5/8 compression nut, 1/2 compression nut, 3/8 and the 1/4 compression nut. All brass compression nuts, nut and sleeve, combo nut and sleeve insert and flare nuts are available at Lowes. Anderson Barrows
PB61 5/8" Compression Nut (3)
Brass
Nut for compression fittings 
Anderson Barrows
PB61 1/2" Compression Nut (3)
Brass
Nut for compression fittings 
the brass compression nut is found at lowes.com
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