This part is a kind of semiconductor called KD1047.

Function of this product has (KD1xxx) Inlet Filters.

Manufacturers : WISE WIT

Image and pinout :

Some of the text within the PDF file :

Inlet Filters for Vacuum Pumps & Blowers KD SERIES OIL SPARATORS Also being imported from Europe, mainly for used for lubricated vacuum pumps such as Becker, Busch, Leybold, PVR, Pfeliffer and Rietschle. They are designed for reducing the exhaust oil pollutant from entering the working environment. A complete range and specification of the oil separators are available in our stock which could meet your immediate demands. Item KD 1020 KD 1022 KD 1030 KD 1031 KD 1033/1 (=V.3000) KD 1035 KD 1041 KD 1047 KD 1048 KD 1049 KD 1050 KD 1051 KD 1052 KD 1053 KD 1054 KD 1060 KD 1061 KD 1066 KD 1067 KD 1068 KD 1069 KD 1085 External Diameter (mm) Internal Dia.upper (mm) Internal Dia.below (mm) Total Height (mm) Gasket Height (mm) Vacuum Pumps Model BECK U2-70~100 RIE VCE-160~250 BECK U2-165~250 [ ... ]

KD1047 PDF Datasheet Download