NPT Full port Isolation Ball Valve. Which is made from a well reconized company Armstrong.

Armstrong Isolation Ball Valve

The Circulator Isolation Flange (CIF) is flanged to work with most circulating pumps. Armstrong uses a full port design ball valve. The practical, all-in-one design of the CIF conveniently isolates the circulator and eliminates the need to drain the system when pump repair or replacement is required.

These isolation flanges can also be used for potable water application because they are made of brass. They are usually cheaper than the plain bronze flanges.