I put this rig together myself and dove with it only a couple times. Single Owner. This system was brand new when purchased from OMS.

M/L - OMS Modular IQ Harness Pack System - Soft/Hard" Concept - Streamline and Better Fit - 9 D-Rings - Incredibly Rugged - Fits 45,100 or Dual 100lb Bladders - Fits All OMS Back Plates OMS Stainless Steel Back Plate - De-burred to eliminate sharp edges - Prevents cuts and abrasions to webbing & BC's - Passivated to prevent oxidation - Accommodates flexible accessory mounting Single Tank Adapter w/ Adjustable Tank Bands