Butterfly Valve
3" Butterfly Valve 03 03.0-88IHH6 Full Lug Style 200psi 316SS CF8M DI
This unbranded piece is a practical option when brand names don't matter.
KF Vacuum Butterfly Valve Clamp Flange Quick Release Butterfly Valve KF40
What I like about this unbranded piece is how straightforward and reliable it feels.