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Kitchen sinks have varying capacities. An average would be, perhaps, 20 - 30 litres.
One could visit the official Elkay website for ideas and to purchase kitchen sinks. Another option would be to browse HomeDepot, and also Amazon may have some Elkay kitchen sinks to your liking.
Your hardware store will sell a variety of kitchen sinks. Home Depot is a major hardware store that sells kitchen sinks. Lowes is also another store that sells kitchen sinks.
Thicker gauge kitchen sinks are usually more expensive, but are better quality.
Many stores sell granite kitchen sinks. Home Depot, Lowe's, and Sears sell granite kitchen sinks. One can also purchase them from Walmart and Menards.
Whitehaus offers all kinds of things for the home. They have kitchen sinks, bathroom sinks, medicine cabinets, kitchen racks, kitchen shelves, toilets and more.
There seems to be no company with the name Kitchen Sinks & Taps. There are several home improvement online stores and brick and mortar stores that sell kitchen sinks and taps. Each one having a website from different years.
One can purchase kitchen sinks of the brand Blanco at hardware stores such as Home Depot, Home Hardware, Lowe's, Rona and Canadian Tire. One can also purchase these kitchen sinks at online shopping sites such as Amazon.
Mostly steel is used.
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$90.
I would not use porcelain on steel sinks anywhere; they're junk. Go with chinaware bath sinks. They are cheap, good looking, and durable. Swanstone looks good in the kitchen, but they're expensive!