Bolted Type Aluminum Porthole Product description: 1. Standard : GB/T14413-93 2. Material: aluminum 3. With/without deadlight, Watertight and gastight 4. Opening: fixed bolted 5. Used for sea-going ship and warships also could used for inland ship 6. Main types: medium type and light type 7. CCS, ABS, BV, DNV certificates is available
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