A suction container usable to suction fluids from the surgical field in an operating room environment. The container has a rigid cover overlying a flexible body portion attached thereto, the cover including a pour spout having a tubular body portion, a segmented thread disposed on an inner wall as a tubular body, the thread having a plurality of spaced segments, each segment defining a ramp and a stop. A locking cap is provided for mounting on the pour spout, the locking cap having a complementary tubular body for insertion into the pour spout, with complementary spaced ramped locking elements disposed on an outer surface of the tubular body for engaging the thread segments in locking the cap on the pour spout in fluid-tight engagement.
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