The G420 Series vented brass oil gage has a female elbow base. 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: 1.00 inch SQ base machined from brass bar stock Female tapered pipe thread base connection (3/8 or 1/2 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 Note: When installing oil gage in a confined space, disassemble base from oil gage to allow the individual base to be installed separately to the reservoir. Once base is in position and secure, reassemble the loose oil gage components to the base. 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.