The Air1/D300/D350/D400 REPAIR KIT an official maintenance package designed for classic D-series and Air1 second-stage scuba regulators. 

### What is Included * Core Components: Contains a replacement poppet assembly, a square pre-dive switch O-ring, and a lever set screw. * 

Intended Models: Compatible with Scubapro AIR1, D300, D350, and D400 second-stage regulators.

 ### Important Service Notes * Inadequacy for Full Overhaul: The standard OEM kit (11.012.045) does not include every single O-ring required for a complete, deep-dive restoration of these vintage regulators

. * Additional Seals Needed: A full overhaul often requires sourcing individual replacement O-rings of specific sizes and durometers, such as: - Top cap O-ring (2-022) - Inlet tube seals (2-016) - Housing seal (2-013) - Poppet stem seal (5-125) - Pre-dive switch substitute (2-116 or 2-117) * Maintenance Recommendation: Scubapro recommends annual service intervals for active regulators. Vintage D-series models frequently require specialized technician knowledge due to their unique balanced-demand-valve design.