The Chase Bays 10AN to 3/4" BSPT is black anodized 6061 aluminum and adapts 3/4" BSPT threads to 10AN, male to male. The primary use for this fitting is Nissan engine specific turbo oil drain ports. SR, RB, CA, etc.
Thread sealant (not teflon thread tape) is highly recommended for the BSPT portion of this fitting, but is NOT to be used on ANY AN connection.