15 U.S. Code § 8002 - Definitions
In this chapter:
The term “ASME/ANSI” as applied to a safety standard means such a standard that is accredited by the American National Standards Institute and published by the American Society of Mechanical Engineers.
The term “barrier” includes a natural or constructed topographical feature that prevents unpermitted access by children to a swimming pool, and, with respect to a hot tub, a lockable cover.
(4) Main drain
The term “main drain” means a submerged suction outlet typically located at the bottom of a pool or spa to conduct water to a recirculating pump.
(5) Safety vacuum release system
The term “safety vacuum release system” means a vacuum release system capable of providing vacuum release at a suction outlet caused by a high vacuum occurrence due to a suction outlet flow blockage.
(6) Swimming pool; spa
The term “swimming pool” or “spa” means any outdoor or indoor structure intended for swimming or recreational bathing, including in-ground and above-ground structures, and includes hot tubs, spas, portable spas, and non-portable wading pools.
(7) Unblockable drain
The term “unblockable drain” means a drain of any size and shape that a human body cannot sufficiently block to create a suction entrapment hazard.
 See References in Text note below.
Source(Pub. L. 110–140, title XIV, § 1403,Dec. 19, 2007, 121 Stat. 1795; Pub. L. 110–314, title II, § 238(1),Aug. 14, 2008, 122 Stat. 3076; Pub. L. 112–10, div. B, title V, § 1576(a),Apr. 15, 2011, 125 Stat. 139.)
References in Text
Section 2052 (10) of this title, referred to in par. (8), was redesignated section 2052 (15) of this title by Pub. L. 110–314, title II, § 235(b)(4),Aug. 14, 2008, 122 Stat. 3074.
2011—Par. (8). Pub. L. 112–10inserted at end “For purposes of eligibility for the grants authorized under section 8004 of this title, such term shall also include any political subdivision of a State.”
2008—Par. (8). Pub. L. 110–314added par. (8).