Does this come with new O-rings or seals?

This condenser ships as an assembly without O-rings. You'll need to source new seals separately before installation to prevent refrigerant leaks at the connection points.

What tools do I need to swap it out?

Basic hand tools, a refrigerant recovery machine (required by law), and an AC vacuum pump to pull a system down and recharge. If you've never done this, a shop with AC equipment is your better bet—it's not a bolt-and-go job.

Can I reuse the refrigerant from my old system?

Not recommended. Always recover the old charge properly with certified equipment, then run a vacuum on the new condenser before adding fresh refrigerant. Old refrigerant can trap moisture and contamination.