U101-S2G microwave variable attenuator 12.4-18 GHz from PRD Instruments. Simply turning the knob on the front rotates an internal vane and moves the visible scale. Download PRD Instruments attenuator dataheet: Status: NOS (New Old Stock) Unused with waveguide flanges sealed with plastic protectors. Ex. USAF Flange size 33 x 33 mm , 4 off. 3.6mm untapped bolt holes , aperature : 15 x 8mm weight 1.5 Kg. Please note FREE carriage on this item. We can also manufacture suitable waveguide gaskets / seals if required.