are these set up for 3/8 lines?

No this valve is only for 1/4" air lines

Does this switch have 3 ports for air lines and does it have a slot for a 4pin electrical connection?

No this one has two barbed fittings on the backside for 1/4" OD Airline/ Tubing only. The barbed fitting ports are marked with supply and delivery on the back side. The one you are looking for is with two barbed fittings for 1/4" OD airline and one electric switch to turn ON and OFF your compressor. That one is not listed on Amazon.

If i hook my compressor to my air tank, air tank to switch, switch to airbags. When i push the switch down, will it only drain my air bags of air? Or

No it will also allow the air to go thru them and fill your bags (car go up). The difference with these are they do not have. A manifold or solenoids. The air releases at the switch/valve. Mine is a very simple setup. 1 Compressor, 1 Tank, 1/4" dot lines, valve switches and air bags. Some connectors and It's and I do what I need. I have a 79 El Camino and it lays down and goes up nice and slow.

Would it be possible if I could see the backside of this switch

sure you can contact us and I can send you picture. 4809991232 or try this link https://www.dropbox.com/s/0yjud11z5uz4apk/air%20lift%2021703%20manual%20paddle%20switch%20airlift%20competitorkiller%207.jpg?dl=0

Brand	Air Lift
Switch Type	Pressure switch
International Protection Rating	IP54
Controller Type	Ring
Connectivity Protocol	Wi-Fi
Net Quantity	1.0 count
Number of Items	1
Manufacturer	Air Lift
Item model number	21703
Manufacturer Part Number	21703
OEM Part Number	21703
Outer Material	Other
Size	Medium
Special Features	Easy to install
Amperage	5 Amps
Manufacturer	Air Lift
Country of Origin	USA
Item Weight	25 g

21703 Paddle Valve Switch

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