This generator was engineered for arsine analysis using the silver diethyldithiocarbamate (SDDC) colorimetric method (meets ASTM/USP and EPA specifications). The arsine absorber has a socket joint, while the scrubber tube has a standard taper 24/40 Clear-Seal joint and a standard taper 12/2 ball joint held together by a size 12 stainless steel ball joint clamp. This unit is manufactured from Wheaton 33® low extractable borosilicate glass (which meets ASTM Type I, Class A and USP Type I standards). Reference: Standard Test Method for Arsenic in Water," ASTM D2972-74.