The 956 BLOK is an optional housing for the 955 Brik LDT. This housing   adds a chamber, magnet and piston. The streamlined anodized aluminum   extrusion houses the sensing element and electronics. The piston   assembly moves over the sensing element that determines the position and  converts it to a readable output. The BLOK is a self-contained unit and  does not have a can or a head assembly.