USA Industrials - Pipe Fitting: 3/8 x 3/8″ Fitting, 316 Stainless Steel - 28825792 - MSC Industrial Supply
Pipe Fitting - 316 Stainless Steel - Instrumentation - Run Tee - 3/8" NPT Female x NPT Male
Horiznext male thread reducer, stainless steel 304 hex pipe fitting, npt 1" to NPT 3/4" adapter, 1-1/4 to 1 inch o.d. water connector (Pack of 2) - Amazon.com
3 INCH NPT SCHEDULE 40 STEEL NIPPLE - FASTFITTINGS.COM