Check the listing for details. Replacement Strap Kit – Pair Shearwater Perdix & Petrel Scuba Dive Computers. Color: Black (Black Buckles), Condition: New. Listed at 29.95 USD. Compatible with all versions of Shearwater Perdix & Petrel Dive Computers. Adjustable for Wetsuits & Drysuits – Provides a comfortable and customizable fit for various dive conditions.