This product needs to be used with special electronic components BCU.
Here is the purchase link of BCU（BCU Ballast control unit for Arkmodel Submarine WTC RC Model – ARKMODEL-HOBBY (arkmodel-shop.com)）.
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Specification:
1. Piston Tank ES76450-1:
Volume: 450ml
Maximum size: 220xΦ78mm
Applicable voltage: 12V
2. Piston Tank ES76450-2:
Volume: 450ml
Maximum size: 220xΦ78mm
Applicable voltage: 12V
(Piston Tank ES76450-1 and ES76450-2 have the same specification, different shapes.)
3. Piston Tank ES63300-1:
Volume: 300ml
Maximum size: 220xΦ65mm
Applicable voltage: 12V
4. Piston Tank ES63300-2:
Volume: 300ml
Maximum size: 220xΦ65mm
Applicable voltage: 12V
(Piston Tank ES63300-1 and ES63300-2 have the same specification, different shapes.)
Application：
1. Piston Tank ES76450-1 is suitable for 212A submarine+double piston tank WTC
(212A submarine+double piston tank WTC needs one ES76450-1 and one ES76450-2)
2. Piston Tank ES76450-2 is suitable for 212A submarine+single piston tank WTC
3. Piston Tank ES63300-1 is suitable for 039 Song class submarine/7603K or Kilo submarine/7616K
4. Piston Tank ES63300-2 is suitable for VIIC subamrine/7602K
You can buy this product for use in arkmodel submarines or in submarines made by yourself.