CatchFlow Bleed Kit with Tray

The catch tray here solves the most annoying part of bleeding a radiator — the inevitable drip onto your carpet or floorboards while you're fumbling to get a cloth underneath in time. It's not huge, so if a radiator has a lot of trapped air and vents more water than usual, you may need to empty it partway through. The key itself feels noticeably sturdier than the cheapest options, less likely to round off on a stiff valve.