AERZETIX - C65136 - Set of 10 Drainage/Storm Protection Caps with 1 Clip 29x12 mm for Window Frame - Nozzle / Cap - Plastic - Hole Ø10mm - Water Fixing - Colour White : Amazon.co.uk: DIY & Tools
20PCS Window Drainage Cover Caps Replacement Weep Hole Covers Plastic for UPVC Windows Accessories 39.5 x 10 x 6.5mm Black : Amazon.co.uk: DIY & Tools
Fischer 61560 Cover Caps FFS-A W For Window Frame Screw FFS Pack x 100 from Lawson HIS