MASTERCOOL (59136 Brass R410A, R22, R404A 2-Way Manifold Set with 3-1/8" Gauges, 3-36" Hoses and Standard 1/4" Fittings Heavy duty forged brass body 3 - 36" hoses with hose holder for convenient storage Free-floating piston type valves reduce o-ring wear Silicone dampened 3 1/8" (PSI, F) gauges smooth out needle movement Gauges can be easily recalibrated in the field to maintain accuracy