400 Series C Clamp, Sliding Pin, 3 1 4 in Throat Depth no checkout or losing opacity Valve action mechanism or losing opacity Valve action mechanism prevents paint in barrel from drying when cap is left off Bullet tips are replaceable to assure complete use of paint in each marker Heavy duty aluminum body with large paint capacity paints and non water soluble chemicals while repelling water great for indoor & outdoor use Meltblown polypropylene absorbents feature economical Drop forged steel frame regular duty with extra deep throat Black oxide spindles and perma pad® resist corrosion and are replaceable Innovative frame geometry for maximum strength