The Scubapro D-series tool is the perfect tool to open both the large black retainer and the small silver nut positioned on the exterior of the D-series regulator body.
 
Key Features & Specifications:
Tailored explicitly for servicing iconic Scubapro D300, D350, and D400 second-stage regulators.
Configured for flawless alignment alongside factory hardware parts such as Scubapro 11.011.117 (Retainer inlet D400) and Scubapro 11.011.126 (Cap D400).
 
Technical Details:
Manufacturer: Scuba Service Tools
SKU: 1200-SST-059
GTIN: 8720828266366