Field glossaryTrapThe U-shaped fitting under a fixture that holds a water seal against sewer gasUsed across 2 Anvilfield field guides, most in Plumbing. Where this shows upPlumbingPlumbing traps and trap seal guidePlumbingPlumbing isometric reading guide Related termsRiserTrap armTrap primerTrap sealWeir Compare your optionsGravity grease interceptor vs Hydromechanical grease trap Back to the full field glossary