Gould & Goodrich Aerosol Case MK 3 or MK 4 K681 SIZE:MK 3 If your device runs low Byrna If your device runs low at the wrong moment so it works best with bladders that have that port UPC MPN SKU STOCKED COLOR FINISH HARDWARE SIZE 768574145052 K681 3 GG K681 3 N Black Plain Nickel MK 3 768574145069 K681 3BR GG K681 3BR N Black Plain Brass MK 3 768574162660 K681 3HS GG K681 3HS N Black Plain Hidden MK 3 768574145076 K681 3W GG K681 3W N Black Basket Weave Nickel MK 3 768574145090 K681 3WBR GG K681 3WBR N Black Basket Weave Brass MK 3 768574162684 K681 3WHS GG K681 3WHS N Black Basket Weave Hidden MK 3 768574145106 K681 4 GG K681 4 N Black Plain Nickel MK 4 768574145120 K681 4BR GG K681 4BR N Black Plain Brass MK 4 768574162677 K681 4HS GG K681 4HS N Black Plain Hidden MK 4 768574145137 K681 4W GG K681 4W N Black Basket Weave Nickel MK 4 768574145151 K681 4WBR GG K681 4WBR N Black Basket Weave Brass MK 4 768574162691 K681 4WHS GG K681 4WHS N Black Basket Weave Hidden MK 4 scuff resistant