**140kPa (20psi) Pressure Regulator - 20mm Female Inlet x 20mm Male Outlet - Ideal for Air Compressors, HVAC Systems & Water Filtration** （优化说明：增加关键词密度，明确产品规格，补充使用场景，符合SEO规范）
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Description
Item A
Must be installed with the vent hole unobstructed.
