The Krueger 16N521 is a magnetic level gauge designed for use with steam boilers, hot water heating systems, and process tanks to indicate liquid level. This level gauge has a 316 stainless steel chamber with mica viewing windows and an aluminum case. It is made in the USA and is adjustable to fit tank connections from 5-3/4 to 7 inches. The level gauge comes with Teflon packing nuts and gaskets. It has a maximum pressure rating of 30 psi at 366°F. This magnetic level gauge uses color-coded flags to clearly indicate liquid level.