This part is a kind of semiconductor called T18.

Function of this product has Multi-Turn Cermet Trimmer.

Manufacturers : Vishay

Image and pinout :

Some of the text within the PDF file :

T18 Vishay Sfernice 3/4" Rectangular Multi-Turn Cermet Trimmer FEATURES • Industrial Grade • 0.50 W at 70 °C • MIL-R-22097 • Tests according to CECC 41 000 RoHS COMPLIANT Fine pitch screw for outstanding setting ability Metal collector improves power dissipation Thermoplast bottom protects track form mechanical stresses due to sealing resin High performance plastic case Large size saddle to prevent back-lash Connections soldered to track Multi-fingered wiper for low contact resistance DIMENSIONS in millimeters T18 SHAFT 1 0.2 2 3 0.6 4.7 ± 0.2 6.4 ± 0.2 Base level 4.8 ± 0.2 ø 2.5 19 ± 0.5 2.54 ± 0.2* 0.8 1.5 ± 0.5* 0.6 4.5 ± 0.5 3.15 ± 0.5* 5.1 ± 0.2* 7.6 ± 0.2* * to be measured at base level CIRCUIT DIAGRAM a (1) b (2) cw c (3) Tolerances unless other [ ... ]

T18 PDF Datasheet Download