Akron Brass ATGK3 [ATGK-3] 3 1⁄2” (89 mm) Apparatus Test Gauge Kit. This Test Gauge Kit is to be used in conjunction with annual apparatus pump testing or for checking the accuracy of pump panel gauges. The ATGK-3 Test Gauge Kit has a convenient space between the pressure and vacuum gauges. This space is for remote mounting of the pressure gauge from Akron's Apparatus Flow Test Kit (AFTK-25). Once mounted in the designated area, the gauges are easy to reference during a pump test.