The Krueger 16N485 is a magnetic level gauge designed for use with steam boilers, hot water heating systems, and other pressurized vessels to indicate liquid level. This level gauge has a 316 stainless steel chamber with mica viewing windows and bronze body. It can withstand temperatures up to 750°F and pressures up to 500 psi. The magnetic level indicator provides a simple, reliable way to monitor boiler water levels. With no moving parts, it is maintenance free. The chamber size is 16" NPS. This level gauge is made in the USA by Krueger.