Features Available in Paediatric, Child and Adult. BVMs can be used in conjunction with FERNO2 HFOC Model 301 to achieve 100[%] oxygen delivery. 40 cm H2O pressure-relief valve standard on paediatric and infant models. Benefits Lightly-textured PVC bag for sure grip and comfort. 360? patient valve swivel connection. Transparent re-breathing valve assembly allows for clear viewing of value function. Comes complete with mask reservoir bag and O2 tubing.