I know that the standard stuff is schedule 40; it looks bigger than a half-inch (at least, if you're measuring the outside rather than the inside). It's not for plumbing, but for a project. Can you tell me more about the sizes?
first of all good chrome does not rust, the biggest problem is its expensive to triple plate and most people dont want to spend the money to get triple plated chrome rims. I had a set that was not cleaned for almost 10 years, when my sister bought them and told me how much she paid, I thought for sure she got ripped off, years later she dropped the truck off for me to detail it to sell it, and I started cleaning these rims, and they were perfect no rust no nothing. I talked to somebody later who had experience in plating and he pretty much said that done right stuff can last for 15 20 years, but done on the cheap its garbage. So think of that the next time your at the tire store, ask them if they have triple chorme plated rims and if so how much they are. Alloy are mainly for weight saving. The lighter the vehicle the better the gas mileage and the more effective the horsepower to weight ratio. Thats why some people spend big bucks going with carbon fiber Its pretty durable up to a point and extremely lightweight. The reason that many of the alloy rims seem to have some kind of plastic coating is to keep the finnish looking good for long periods of time and to protect the metal from tarnishing. The air we breath is pretty toxic stuff in big cities which kind of sucks and it corrodes everything including our lungs.
Most fire alarms that employ a glass panel to allow access to the alarm mechanism are obsolete and are not in use. Further, the only ones I know of activated the alarm the minute the glass was broken, some of these were allowed to stay in use if a more readily available means of breaking the glass was available. Such as a handle mounted to the frame that would lever the handle into the glass and break it. Usually a button would then be allowed to pop out and activate the alarm. I know of no modern alarm pull station that allows access to a ahndle after a panel of glass is broken
