... Silicon; Coiled Burdon; Silver Solder. Stainless Steel Manometer with filling oil Covers style: Yappy brim; Window: Polycarbonate; Size: Upon to request ... ; Connection: Brass internal&bottom connection; Thread: 1/8", 1/4", 3/8", 1/2", 5/8", 7/8" NPT, BSP, BSPT ... esteemed inquiry.It's ideal for using fuel station and oil development fields.