According to the US Army document TM-9-4910-430-10 this works for Cummins Diesel engine models H HR NH, HVH, and NF .It looks nice, it might be nos.
COMPRESSION Adapter Buds Diesel engine model DH and other engin
Otc Gm Cummins Diesel Compression Test Adapter 6097 unused
MOTORITE Cummins DIESEL ENGINE COMPRESSION TESTER 70-0306 ADAPTER 1K PSI GAUGE
Snap-On M3585 Diesel Compression Adapter for Cummins/Case 8.3L C-Series
Lang Tools TU15-75 Diesel Compression Test Adapter Cummins Isb (tu1575)
Snap On EEPV313C Diesel Compresson Adapter Cummins 24v 5.9L
