( 1 ) NEW ARCHON AKGF030-A19A000 is a single wall sight flow indicator designed for (3 Inch Pipe Size) Sight Length 3-1/2 inch.. It is manufactured by ARCHON INDUSTRIES in the United States...Body Material 316 Grade Stainless Steel...Bolt Material Carbon Steel...Standards ASME. Connection Type Flanged.. Window Material Borosilicate.  This product is ideal for monitoring the flow of liquids in various industrial applications.