The H4PM is a sealing cap designed for female PV cable connectors in the Amphenol H4 Helios connector system. This accessory provides environmental protection and sealing for unmated female connector ports, preventing moisture and contaminants from entering the connector cavity. The cap features a compact design with a diameter of approximately 8.5 mm and is compatible with the H4 standard cable connector series used in photovoltaic applications. It is commonly used in solar installations to protect connector ports during storage, transportation, or when connectors are temporarily disconnected, ensuring long-term reliability and maintaining IP68-level protection standards when properly applied.