This listing is for one brand new Grey Anodized 6061 aluminum CGA347 nut and nipple. This fitting is commonly used on SCBA tanks, or other inert gasses and sometimes high pressure compressed air. This fitting is good for a maximum pressure of 5000psi. The end of the nipple has male 1/4" NPT RH threads. Please make sure your valve is a CGA347 before you buy this item. Thank you.