Beepbeep13
Full Member
- Joined
- Mar 15, 2014
- Messages
- 242
- Reaction score
- 185
- Golden Thread
- 0
- Location
- MA, South Shore
- Detector(s) used
- Garrett AT Pro (Thanks Big Boy Hobbies) Makro Pinpointer
- Primary Interest:
- All Treasure Hunting
I've never seen a "concave" freeze plug, they are usually flat with a 90° lip on them, and I have not seen them labeled beforeI don't think it's a button..it looks like a discarded engine freeze plug.