Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.
You cannot tap the hole as there is material just below the opening. You need to install some "brass" 3/4" freeze plugs. At least I believe their 3/4" . Could be 1" . It's been a few years since I changed mine.