If you're looking for a brass tube fitting then Amazon has a few choices from various brands and sizes for plumbing or building supplies. Some choices are the engineering round brass tube, compression connector, flare union tube fitting, round brass tube, flare cup fitting or the brass drain extension tube pipe to name a few. For any brass tube fittings or any project Amazon has a good selection. K&S ENGINEERING CO 9123 ROUND BRASS TUBE (pack of 3)
"K&S" ROUND BRASS TUBE *Bulk *5/8" OD x .014 Wall x 36"L 
Polished Brass Drain Extension Tube Pipe 1-1/2" x 8"
by Westbrass
This premium finish 1-1/2" x 8" extension tail piece features solid brass construction throughout. Can be cut to size. You'll be able to appreciate both the beauty and performance of this item for years to come thanks to superior quality finishing and solid construction. 
the brass tubefitting is found at amazon.com
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