There are many retailers which sell snow tubes for sliding or sledding down a hill in winter. These items are usually only available in stores during the winter months. Some websites which carry these products are Wal-Mart, Target, Amazon, eBay, Hayneedle, and L.L. Bean.
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Clear plastic tubes can be purchased at some local hardware stores and at other local stores such as Wal-Mart or Target. If looking to purchase online you can find clear plastic tubes on ebay or amazon.
Maybe you can search Jiangyin Mingding Aluminum Products Co., Ltd., they have various types of aluminum alloy tubes, and they can also accept customer customization. I have worked with them, the service is very good, and the arrival time is also very fast, you can try to contact them.
Galvanized tubes are steel tubes that are coated with zinc to protect them from rusting.
The eustachian tubes are the auditory tubes that link the nasopharynx to the middle ear.
Locomotives have sanders - tubes that drop sand on the rails ahead of the locomotive's wheels to aid traction when going up hills. The most modern locomotives also use anti-wheel-slip technology to mimimize wheel slippage; this is computer-controlled.
end caps and stops
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www.gemplers.com/tubes. They have a complete line of tubes.
One can purchase vintage tubes from eBay where there are hundreds of such items available for purchase. They are also available to buy from 'Vintage Electronics'.
You can purchase test tubes from a science equipment magazine. They will be available in any good stores. Also you can go onto eBay to buy some test tubes.
One can purchase labware such as test tubes on amazon, eBay, hometraining tools. There are also local places where one can purchase labware such as Argos, and the main supermarkets may offer these.
Radio technology has come a long way since the days of tube radios. However, tube radio fans can purchase replacement 6L6 tubes online at thetubestore.
Ebay Ebay
One can purchase square tubes at Metals Depot, Discount Steel, Speedy Metals, All Metals Inc, Home Depot, Amazon, rsteeldepot, eBay, Yale Steel, and Grainger.
Here's one place where you can buy them: http://www.tubesrus.com/packaging_materials/paper-tubes/heavy-duty-mailing-tubes/default.html. They take custom orders.
One can get heat exchanger tubes by contacting a company that provides this product such as Phoenix Equipment. One can also purchase online at Grainger.