A straight adapter with an AN 37-degree male flare on one side and a BSP parallel male thread on the other, used to bring AN braided hose onto components tapped in BSP. BSP threads use a 55-degree flank form and are a different standard to NPT, so the two must never be substituted for one another even though the sizes sound similar. A parallel BSP thread seals at the shoulder on a bonded washer or O-ring rather than on the thread flanks, so tape and sealant are not the answer here. Confirm the exact port size on your component before ordering, as this listing does not carry a published AN size or thread figure.