Amazon.com: 304 Stainless Steel Compression Fitting Ferrule, 1/4" Tube OD x 1/4" NPT,3/8" Tube OD x 1/4" NPT,3/8" Tube OD x 1/2" NPT Male, Straight Adapter Connect with Ferrules (NPT1/4-1/2"OD) : Industrial
Stainless Steel Ferrules and Tri-Clamp Fittings | HOLLOWAY
Megairon 1/8" NPT Male x 6MM Double Ferrule Compression Tube Fitting,Stainless Steel SS304 Male Straight Adapter - Amazon.com