RS Pro Inverted Bucket Steam Trap IB12. These inverted bucket steam traps are recommended when the most important requirements are overall operating efficiency and trouble free service life. They are best suited for service at medium and high steam pressure due to operating intermittently, either wide open or tightly closed. Features and Benefits. Connections are female screw Horizontal installation Intermittent discharge Discharges condensate at steam temperature Unaffected by water hammer and vibrations Easy to maintain Built-in strainer