"BREATHER 0.125 IN.DIA DRILLED UNTHREADED LOCATED DEAD-CENTER; 2 HOLES 180.0 DEG APART 1.120 IN. CENTER TO CENTER,FIRST 0.578 IN. THRU WITH 3/8-18NPT X 0.450 IN.D BOTH SIDES,SECOND 0.437 THRU WITH 1/4-18NPT X 0.41 IN.D; HEX 3.000 IN.FLAT TO FLAT AND 3.460 IN.POINT TO POINT"
STDC
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION
"MIL-STD-1303,SYSTEM NO.76 MIL STD SINGLE TREATMENT RESPONSE BODY"