The Brixwell Double Hung Vent Lock Single Action is a window hardware component designed for use on single hung and double hung sash windows where controlled ventilation and restricted sash movement are required. This vent lock installs on the top sash stiles, with one unit mounted on each side, and is clipped into the slot on the face of the top sash for proper placement. It operates using a single action mechanism that allows the sash to be held in a vented position while limiting further opening. The vent lock is manufactured from plastic material and finished in white, allowing it to match common window sash frames and interior trim. The body length measures 1-7/8" and the width measures 9/16", providing a compact profile suitable for standard sash configurations. The face plate length measures 2", offering consistent surface contact once installed. A pin diameter of 9/32" supports proper engagement during locking and release. This vent lock is designed as a tamper proof component to restrict unintended sash movement when the window is partially open. It is commonly used during window repair or replacement when matching operation type, mounting method, material, finish, and dimensions are required for proper sash window function.