An inlet device for a gravity separator for separating a fluid mixture including gas and liquid. In operation, a PSA is connected to a device which provides some service to a user. Both deep drawn and solid resonator designs are provided. Further, in this example, the second support member is vertically positioned relative to the base members such that a set of holes in each of the second support member and the pair of base members are horizontally aligned and fasteners are used to secure the two to each other in that position. The clamping means may also include an attachment rod in the form of a bolt which registers with threads within a hole in the duplex jaw and a bolt head which engages the upper surface of the plate.