A wood siding that is made so that the siding can be over lapped at the edges of planks to for a siding membrane to exclude rain water during rains. The siding is usually installed with the planks horizontal.
A glass window in the liquid line of a refrigerant system that allows one to see if there are vapor bubbles in the liquid refrigerant line. Sight glasses are also used in swimming pool back flush lines and other types of lines or pipes to determine the visible...
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