Accumulators are often effective in reducing noise from hydraulic systems due to their pressure spike dampening effect. Their use is feasible in most cases where replacements are easy. However, in certain conditions, like harsh environments or certain operations, such as subsea fishing, accumulator replacements are challenging. In-line dampeners provide a straightforward solution but have never been designed to cater for resonance dampening as such. Commercially developed in-line dampeners also have nitrogen-filled bladders or act like and behave as accumulators, posing the same risk of rupture and replacement. A simple device has been developed that eliminates the need for a bladder/bladderless accumulator for the moderate-pressure, high-rate flow of a non-Newtonian fluid for reduced resonance. Test results show minimal backpressure from the use of the device. This brief only addresses the resonance factor and not the usual pressure spike that hydraulic lines suffer from where accumulators work best. Proprietary material and innovation used in the design of the dampener are not discussed here. Sound attenuation for various input levels is compared between the device made and a traditional accumulator. Test results were used to complete the in-line bladderless nitrogen-free resonance attenuation device, which performs better than having an accumulator in the system.