Blue anodized.
6AN ALUMINUM TUBE NUT AND SLEEVE BLACK FOR 3/8 HARD LINE
Nitrous Oxide Systems Genuine NOS16230 Nitrous -6AN-660 Bottle Nut adapter
10x 6AN Aluminum Tube Nut & Sleeves for 3/8" OD Hard Lines Tubes
6AN STAINLESS STEEL NUT AND SLEEVE S FOR 3/8 FUEL LINE (6ea)
8x 6AN Aluminum Tube Nut & Sleeves for 3/8" OD Hard Lines Tubes
-6AN Nitrous Bottle Nut Adaptor CGA 660 for NOS Nitrous Bottle w/ Teflon Washer
