Blue Sea 7601 DC Mini ACR Automatic Charging Relay - 65 Amp [7601] Camping | Accessories while the 1600 model has

while the 1600 model has lipseal

A salt solution is mixed and placed in the salt feed tank

Smart toilet control (STC) with water saver feature

Manufacturer item #1810141

Blue Sea 7601 DC Mini ACR Automatic Charging Relay - 65 Amp [7601] Camping | Accessories while the 1600 model has7601 DC Mini ACR Automatic Charging Relay 65 Amp Features: 65 Amp continuous rating manages the charging current from alternators up to 65 Amps found on most outboards and many inboard engines Compact case design allows surface and panel mounting Senses charging on two battery banks Snap on cover insulates terminal connections LED indicates ACR status 1 4" x . 032" male quick connect terminal for ground 5 8" (16 mm) stud length to accept multiple