The ASP Defender D1 TEST Insert is the inert TEST/ training cartridge for the ASP Metro Defender D1.

Unlike common throwaway aerosol can defense products, ASP Defenders are highly-engineered dispersion devices that use a proprietary, replaceable OC (Oleoresin Capsicum) Insert. These Inserts are precision-machined from aerospace aluminum and solid brass, and incorporate a specially-produced valve system and patented dispensing mechanism.

This Insert is compatible with ASP Metro D1 Defenders and Sport D1 Defenders, and contains approximately six 1/2-second bursts.