Stainless steel housing Anodized black finish Solid brass internals for a long and accurate service life 1-1/2" gauge face is filled with glycerin to prevent needle bounce and covered with a real glass lens Glass lens prevents fading, distorting and melting Installation is easy; gauge has 1/8" NPT threads 0-100 lb. range; ; Note: Gauge only 1/8" NPT adaptors, fittings and extensions sold separately