StrummHey Strumm, the pellet kit allows a Tritium vial to be used with the 3 series glow fob keychains.
http://www.tecaccessories.com/Glow-Fob-Pellet-Kit
"The TEC Glow Fob Pellet Kit is for use with all TEC Accessories 3 Series glow fobs. By simply removing the o-ring at the bottom of the glow fob housing, you can exchange the standard glow pellet with one that you can make yourself. This do-it-yourself kit includes the necessary components to make your own replacement pellet, just select a project on the "Projects" tab and see what you can create!"
And here are the instructions for the DIY pellet kit: http://www.tecaccessories.com/PDF/TA_DIY_Kit_Trit_Project.pdf
http://www.tecaccessories.com/Glow-Fob-Pellet-Kit
"The TEC Glow Fob Pellet Kit is for use with all TEC Accessories 3 Series glow fobs. By simply removing the o-ring at the bottom of the glow fob housing, you can exchange the standard glow pellet with one that you can make yourself. This do-it-yourself kit includes the necessary components to make your own replacement pellet, just select a project on the "Projects" tab and see what you can create!"
And here are the instructions for the DIY pellet kit: http://www.tecaccessories.com/PDF/TA_DIY_Kit_Trit_Project.pdf