Designed for arsenic analysis by the diethyldithiocarbramate colorimetric method. Meets APHA Standard 104A, ACS/USP, and EPA specifications. All wetted surfaces are borosilicate glass or PTFE clad joints. Code -40 complete unit consists of one 24/40, 125ml erlenmeyer flask, one 24/40 to 12/2 scrubber and one 12/2 absorber. 12/2 (size 12) clamps can be found in product families 7666,7668 & 7669.