Replacement Part : Built as a 1091LX pool skimmer weir replacement flap, this part helps buyers identify the skimmer door they need for routine pool maintenance and debris control. Measured Size Reference: The confirmed 21 cm/8.27 inch x 13.5 cm/5.31 inch size gives you a practical way to compare your existing part before ordering and reduce mismatch during replacement. Visible Comparison : The rectangular flap shape, side tabs and lower slot openings give clear visual cues for checking whether the replacement shape aligns with your current skimmer setup. White Finish Cue: The white build and straightforward flap form make it easier to compare the look of your current part while shopping for a replacement used in everyday pool care. Single Pack Reminder: The package includes a single replacement flap for pool maintenance use, so compare the dimensions and tab layout with your original part before installation.