Fixtures & Appliances Flashcards
6 cards from real Plumbing practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Fixtures & Appliances flashcards as text
What is the maximum flow rate for a residential showerhead under current federal EPAct standards?
Answer: 2.5 GPM
Federal EPAct standards set the maximum flow rate for residential showerheads at 2.5 gallons per minute (GPM) at 80 psi.
What is the maximum flush volume for a water closet (toilet) under federal standards?
Answer: 1.6 GPF
Federal plumbing standards require water closets to use no more than 1.6 gallons per flush (GPF), with WaterSense certified models at 1.28 GPF.
What is the minimum rough-in distance from the back wall for a standard toilet rough-in?
Answer: 12 inches
The standard toilet rough-in is 12 inches from the finished back wall to the center of the drain, with 10-inch and 14-inch sizes also available for non-standard applications.
What type of wax ring alternative provides a better seal for uneven floors when installing a toilet?
Answer: Double-stacked wax ring or foam gasket seal
For uneven floors or extra-thick flooring, a double-stacked wax ring or a foam gasket seal (like Fluidmaster) provides a better, adjustable seal than a single wax ring.
What is the purpose of a P-trap under a kitchen sink?
Answer: To hold a water seal that blocks sewer gases from entering
The P-trap under a sink holds a water seal that physically blocks sewer gases from rising up through the drain opening into the living space.
What is the correct rough-in height for a bathroom lavatory (sink) drain?
Answer: 16–20 inches AFF
Standard lavatory drain rough-in height is 16 to 20 inches above the finished floor (AFF), with 18 to 20 inches being most common for standard-height vanities.