For use with viscous fluids, semi-solid bitumens, emulsions, etc. For ASTM Standards D 70, D 115, D 234, and D 1963; also for AASHTO standards T-43, T-151, and M-125; and ANSI Methods A37.71 and K34.1 Standard taper 24/12 solid stopper, concave on the under side, with central opening 1.6 mm bore …