These are high-quality 4-pin GX-16 aviation connectors. The metal locking ring on the female side will seal tightly to the thread on the male side. Tinning and soldering them will be effortless compared to the regular off-the-shelf GX-16.
Zinc alloy housing
Noticeable paint chipping
Fully functional when soldered and connected
Please proceed with caution since there will be no refund or support regarding B-stock products.