The 1590WTRPBBK pairs the "Narrow Trapezoid" outline of the 1590TRPB with a black textured finish and a silicone gasket. It is aimed at builders of effects pedals and small electronic instruments who want a tapered case that looks different on a pedalboard or bench, with IP65 protection against dust and liquid.

Construction is diecast aluminum alloy for both box and lid. The material is rugged yet easy to machine, and the low side wall draft angle of 2° or less helps when fitting a PC board. Four #6-32 x 1/2" machine screws hold the lid into factory-tapped holes; for the gasketed assembly the recommended torque is 25-30 cN.m [36-43 ozf.in].

This part measures 4.41 in (112 mm) in length, tapering from 3.11 in (79 mm) at the large end to 2.44 in (62 mm) at the small end, with a 1.54 in (39 mm) depth; the nominal size is listed as 4.37 in x 3.13 in x 1.5 in (111 mm x 80 mm x 38 mm). The drawing gives an inside length of 106.29 mm [4.184 in] and inside height of 35.20 mm [1.386 in], and the maximum P.C. board figures are 71.66 mm length and 105.29 mm width.

The 1590WTRPBBK ships with box, lid, 4 cover screws and silicone gasket at a shipping weight of 0.37 lbs (0.17 kg). It is RoHS and REACH compliant, and matching black liquid resistant cover screws with O-ring are available as 1590WMS100BK.