Green double arrow = spring Note: This door will open from a push by the red Aluminum door. It will be closed when tension is applied from the stretched spring. This grey door will made out of PVC and sealed with Viton as well. Viton Seal PVC casing CO2 sub-chamber N2O sub-chamber Viton Seal Note: This seal which forms three sides of a rectangle and is on both sides of the sliding red door will now be on the chamber walls. This way any rubbing action will occur between the Aluminum red door and the Viton seal material. A quick mock-up of the linear actuator mounted to the outside of the sub-chamber housing. Note that this basic seal design and linear actuator will be used on the outer door as well. We are in the process of adding to and making these changes in this model.