Which way does the packing ring ("gasket" in parts list) go into the gun behind the packing nut - flat-end into gun or curved end into gun?

I have the curved part inside and the flat part toward the nut/trigger. The nut was more flat on the end is why I installed it this way. I had already uninstalled the old one so I don't really know for SURE. Nonetheless, it stopped the leaking from the packing nut I experienced before replacing it.

Does this kit work for the DeVILBISS JGA 520 Spray Gun? The air valve is bent and needs replaced.

The first thing we would need to know is what size needle you have. Example 1.4mm - 1.3mm etc.

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DeVilbiss802425 StartingLine Full Size Gun Repair Kit

Product ID: 26570509

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📦Compact, organized packaging

⚙️Complete OEM rebuild kit

🛠️Easy, hassle-free installation

Description

⚡ Upgrade your spray game with DeVilbiss precision!

FULL GUN REVIVAL - Restore your StartingLine spray gun to peak performance without the cost of replacement.
READY WHEN YOU ARE - Compact, clearly labeled packaging means no fumbling—just fast, efficient repairs.
COST SMART SOLUTION - Avoid expensive new guns—maintain your equipment with a budget-friendly rebuild kit.
GENUINE OEM QUALITY - Trust in authentic DeVilbiss parts engineered for perfect fit and durability.
EFFORTLESS MAINTENANCE - Designed for quick disassembly and reassembly, saving you valuable time on the job.

The DeVilbiss802425 StartingLine Full Size Gun Repair Kit includes all essential OEM parts to fully rebuild your StartingLine spray gun. Lightweight and compact, it’s designed for easy installation and cost-effective maintenance, ensuring your equipment performs like new without the expense of replacement.

Specifications

Manufacturer	DeVilbiss
Brand	DeVilbiss
Model	802425
Item Weight	0.16 ounces
Product Dimensions	7 x 4.5 x 0.2 inches
Item model number	802425
Is Discontinued By Manufacturer	No
Exterior	exterior_finish
Manufacturer Part Number	802425

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