Air line pressure gauge for service with compressors, filters-regulators, air lines, pneumatic tools and equipment. No. 24-801: Pressure Range: 0 to 200 psi, Connection Type: 1/8" MNPT, Mount Type: Back Mount, Pkg Qty: 1, Package Type: Box No. 24-803: Pressure Range: 0 to 160 psi, Connection Type: 1/4" MNPT, Mount Type: Back Mount Thanks for shopping Hipp Hardware Plus's Online Store for all your DIY and Home Improvement needs. Remember Hipps Help!