The two threads you pointed out on the MB Sturgis Sturgi-Stay T-Fitting for Type 1 Valve # 103612-MBS are on the outside a Type 1, ACME fitting and on the inside a POL fitting.
A POL fitting is commonly found on the ASME tank used on motorized RVs to connect the propane tank valve to the RV regulator. Before the introduction of Type 1 fittings, POL fittings were the standard fitting for all propane tanks. Now, both types of fittings are featured on DOT cylinders. The POL fittings are... view full answer...