Waters CorpLOW VOLUME INSERT 250UL FOR 4 - Fisher Sci. Low volume insert, 250uL for 4mL Screw Cap Vial 144/Pkg,Low Volume Inserts and Springs,Glass Type: Type 1, Class A,Volume Cap: 250 uL. Catalog No. 50-785-072. $161.20 / Each. Laboratory analytical 250ul spring bottom vial insert for vials. Athena Vial Micro-Insert, Size: 250ul, Rs 800 /pack