The G320 Series vented brass oil gage has a large straight hex base with male pipe thread. A shield with machined viewing window surrounds the tubular glass sight. The viewing window has 360° adjustment for optimal orientation to view fluid after installation. The sealing gaskets are contained on both their ID and OD to facilitate trouble-free assembly after on-site repositioning of the viewing window. Standard Features: Gage base machined from brass hex bar stock Male tapered pipe thread base connection (3/8, 1/2 or 3/4 inch NPTF) .53 inch wide viewing window, length varies from 4.33 to 12.58 inches depending on gage selected 360° adjustment of viewing window Suitable for use with most machine lubricating oils Temperature Rating: Maximum operating temperature of 250°F (121°C) with standard Buna N seals. For applications not compatible with Buna N seal material, consult factory for available options and corresponding temperature ratings.