The G800 Series vented brass oil gage has a male elbow base with integral drain. Flow through the drain is controlled by a needle valve in the gage base. 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: .69 inch SQ base Machined from brass bar stock Male tapered pipe thread base connection (1/8, 1/4 or 3/8 inch NPTF) Designed for removal of base to facilitate gage installation in a confined space Drain with needle valve control .39 inch wide viewing window, length varies from 1.33 to 5.33 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.