This will depend on what type of gasket you need and what it is for. I came up with .44 cents as an average starting price. www.gasketstogo.com
Approx $ 75.00
head gasket? Between $800 and 1,800.
If you do it yourself, maybe $50. If you take it to a shop, probably at least $1,500
No, you don't if the gasket is rubber.
HDPE pipe can use a rubber ring, if the rubber ring is properly sealed with a steel gasket. The rubber ring must be placed in a groove in the pipe and then the steel gasket is placed on top of it.
The spring end of the thermostat goes into the engine. If you have the rubber ring gasket, the rubber ring has a slice on the inside of the gasket. Fit the rubber gasket around the outside of the thermostat before you set the thermostat in place. Be sure the thermostat and gasket are in place with the spring end facing the engine and install the thermostat housing, done.
Most older Chevy silverados use a rubber gasket around the thermostat itself... the upper housing also has a rubber gasket built into it. Did you move the gasket from the old one & put it on the new one? There is also a paper gasket you can use, but you need a lot of permaseal & it isn't as good. Most parts store will have the rubber gasket & it's about $1.00
An oil filter gasket is the rubber seal at the bottom of the oil filter that seats on the engine.
Flat washers. Spring washers. Rubber gasket. Felt washers. Asbestos gaskets.
A radiator does not require a gasket so this may refer to a rubber mounting that prevents the radiator from jolts and damage.
you go to a Machanic.
The rubber gasket failure.