Fabco-Air Inc.
Fabco-Air PV1-C Port Mounted Flow Controls PV1C (Pack of 3)
This is a refurbished SUPERMICRO system, but it still feels like new.
Fabco-Air PV1-C Port Mounted Flow Controls PV1C
A nice touch is the silver handle that provides a secure grip even when wet.
NYCOIL-Air PC2-D Port Mounted Flow Controls PC2-D (Pack of 2)
You will find ji219027 has a reputation for being low-maintenance.