IAPMO SPS 4-2019 covers special use suction fittings which are designed to be totally submerged and of suitable material for use in swimming pools, spas, and hot tubs and specifies requirements for materials, physical characteristics, performance testing, and markings. A component varying in design and/ or operation may qualify under this standard. Appropriate tests and investigations shall indicate the component performs as well as components complying with this standard. Such components shall meet the requirements for materials, finishes and construction in this standard A general concept of products covered under this standard is shown in Figure 1. The fittings, covered by this standard, are identified for use in swimming pools, spas, and hot tubs to provide safety from body and hair entrapment, reflecting the current state of the art of industry testing.