How to set up a/c and heat

Found this one on Ebay, not sure of the quality, but for $7.25.
DC 12V Electric Solenoid Valve 1/2" Plastic For Water Air N/C Normally Closed US
$7.25
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DC 12V 1/2" Electric Solenoid Valve. It cannot be used for inflammable gas or fluids. If you want to use the solenoid valve for inflammable gas or fluids, you must buy the EXPLOSION PROOF valve. We do...