A tissue sealant spray applicator for applying a multi-component fluid into a body cavity through a trocar assembly extending into the body cavity, the trocar assembly having a trocar tube for introducing an elongate delivery tube into the body cavity, a vent outlet and forming a vent passageway for placing the vent outlet in fluid communication with the body cavity, said tissue sealant spray applicator comprising: a barrel assembly containing the multi-component fluid, the barrel assembly including a distinct chamber (20, 22) for each of the components and a piston (24, 26) movably positioned in a proximal end of the barrel assembly, a spray adapter member having: a gas inlet connection; a plurality of fluid inlets (52, 54), with at least one of the fluid inlets in corresponding fluid communication with one of the chambers; and an adapter member outlet in fluid communication with the gas inlet connection and the plurality of fluid inlets; an elongate delivery tube having a proximal end connected to the adapter member outlet of the adapter member, an opposite distal end region forming a spray outlet in fluid communication with the gas inlet connection and the plurality of fluid inlets, the elongate delivery tube being receivable in the trocar tube of the trocar assembly, and sized to extend through the trocar tube with the distal end region of the elongate delivery tube exposed and the elongate delivery tube being rotatable relative to the trocar tube; a main gas tube in fluid communication with the gas inlet connection; a gas supply tube in fluid communication with the main gas tube; a venting valve assembly including a gas connecting end attached to the gas supply tube, a valve conduit in fluid communication with the gas connecting end, a vent path connector end configured to attach to the vent outlet of the trocar assembly and a vent path in fluid communication with the vent path connector end, the venting valve assembly also including a biased movable valve rod slidably located within the valve conduit and configured to provide a seal within the vent path, the valve rod being operable by gas pressure within the valve conduit to slide against the bias and provide a selective opening for gas to pass from the vent path to the atmosphere; and a vent opening, wherein the vent opening is in fluid communication with the vent path upon said selective opening of the valve rod. a barrel assembly containing the multi-component fluid, the barrel assembly including a distinct chamber (20, 22) for each of the components and a piston (24, 26) movably positioned in a proximal end of the barrel assembly, a spray adapter member having: a gas inlet connection; a plurality of fluid inlets (52, 54), with at least one of the fluid inlets in corresponding fluid communication with one of the chambers; and an adapter member outlet in fluid communication with the gas inlet connection and the plurality of fluid inlets; a gas inlet connection; a plurality of fluid inlets (52, 54), with at least one of the fluid inlets in corresponding fluid communication with one of the chambers; and an adapter member outlet in fluid communication with the gas inlet connection and the plurality of fluid inlets; an elongate delivery tube having a proximal end connected to the adapter member outlet of the adapter member, an opposite distal end region forming a spray outlet in fluid communication with the gas inlet connection and the plurality of fluid inlets, the elongate delivery tube being receivable in the trocar tube of the trocar assembly, and sized to extend through the trocar tube with the distal end region of the elongate delivery tube exposed and the elongate delivery tube being rotatable relative to the trocar tube; a main gas tube in fluid communication with the gas inlet connection; a gas supply tube in fluid communication with the main gas tube; a venting valve assembly including a gas connecting end attached to the gas supply tube, a valve conduit in fluid communication with the gas connecting end, a vent path connector end configured to attach to the vent outlet of the trocar assembly and a vent path in fluid communication with the vent path connector end, the venting valve assembly also including a biased movable valve rod slidably located within the valve conduit and configured to provide a seal within the vent path, the valve rod being operable by gas pressure within the valve conduit to slide against the bias and provide a selective opening for gas to pass from the vent path to the atmosphere; and a vent opening, wherein the vent opening is in fluid communication with the vent path upon said selective opening of the valve rod.