Compressor Missing Freeze Plug

[stevegr]

One of the freeze plugs is missing on the top-engine side of my compressor. Pics Attached. Need to drive my Deuce tomorrow and was wondering if I should wait till I get a new freeze plug before I drive it? The compressor still pressurizes the system good and the air buzzer stays off all day. With the engine running, I put my finger over the hole and felt a very small amount of pressure. I assume this cap is used to plug a drilled hole and just keeps water and dust out. Looked around on SS a little bit, checked the TM and googled for this but coudn't find this particular view (pic 1632) of the compressor. It is a Midland-Ross Type 1 With Unloader, Part# MS-51322-1.

 

[RAYZER]

hmm, different setup than mine.