A4 316 Marine grade stainless steel. All washers are 1.2 - 1.5mm thick.
eBay
High Pressure Washer Ball Valve Kit 3/8 or 1/4 Quick Connect Fittings for Power Washer Hose Control Water Flow Switch 4500 PSI
Aliexpress UK
REPAIR WASHERS BRIGHT ZINC PLATED. MILD STEEL. 5, 10, 20, 30, 50, 100. to select size & quantity. And 1.5mm Thick.
eBay
20/50/100Pcs 11026-01M02 11026-JA00A Metal Oil Drain Plug Crush Washer Gasket For Infiniti 2010-2011 Oil Drain Washer Parts
Aliexpress UK
STAINLESS STEEL PENNY REPAIR WASHERS.
eBay
High Pressure Washer Hose Adapter M22 High Pressure Pipe Quick Connector Converter Fitting for Karcher K-series Pressure Washer
Aliexpress UK
REPAIR WASHERS BRIGHT ZINC PLATED. MILD STEEL. 5, 10, 20, 30, 50, 100. to select size & quantity. And 1.5mm Thick.
eBay
Pressure Washer Quick Connect Kit M22 15mm/14mm to 1/4" Hose Connector Fittings for Power Washer Gun Hose Pump 5000 PSI
Aliexpress UK
Sizes: M4 x 12mm, M4 x 15mm, M4 x 20mm, M4 x 25mm, M5 x 15mm, M5 x 20mm, M5 x 25mm, M5 x 30mm, M6 x 18mm, M6 x 20mm, M6 x 25mm, M6 x 30mm, M6 x 35mm, M6 x 40mm, M8 x 20mm, M8 x 25mm, M8 x 30mm, M8 x 35mm, M8 x 40mm, M10 x 20mm, M10 x 25mm, M10 x 30mm, M10 x 35mm, M10 x 40mm, M12 x 30mm, M12 x 35mm, M12 x 40mm.
eBay
CONENTOOL 6 in 1 100Bar Electric High Pressure Washers 650W Car Washer Water Gun Garden Cleaning Tool For Makita 18V Battery Pin
Aliexpress UK
Penny Washers / Fenders / Mudguard M3 M4 M5 M6 M7 M8 M10.
eBay
M22 High Pressure Washer Hose Connector Converter Power Washer Water Gun Conversion Interface For Bosch Karcher Lavor Nilfisk
Aliexpress UK
Manufactured from A4 marine grade stainless steel for maximum corrosion resistance. Stainless Steel A4.
eBay
Garden Washing Cleaner High Power Pressure Car and Hose Nozzle Washer Water Spray Gun Adjustable Garden Hose Car Wash Water Gun
Aliexpress UK
Bright zinc plated steel penny washers.
eBay
Pressure Washer Hose Extension Connector Pipe Adaptor For Karcher AR Blue Bosch Black Decker Patriot Bort Daewoo
Aliexpress UK