Accel's 1/8" NPT rear mount liquid filled pressure gauges are premium quality all the way. The top of the 1 1/2" housing holds a pure glass lens that will not melt, distort, or fade. The housing is Stainless Steel and the solid brass internals are bathed in a vibration dampening glycerin. Available in your choice of 60 lb. or 100 lb. scale gauges in both polished and black. Both dial faces proudly display the Thunder Twin graphics in four color reproduction.