4" ANSI B16.5 weld neck style sight glasses are designed for welding to a stub end pipe or may be supplied with a cut radius on the weld neck to straddle the side of a pipe. Each is rated for 150PSIG (10.3 Barg) at 300ºF (149ºC) with a tempered soda lime lens and 500ºF (260ºC) with a borosilicate lens. Sight glass flanges are constructed using code materials. Optional accessories include Series PL, MSL, SLEX, REX, FBX illuminators, and Type I wipers.
