Expandable Well Caps photometer or ISE & Specialty Sensors

or ISE & Specialty Sensors to find compatible sensors — or browse the full YSI Parts & Accessories collection

internal temperature sensor

Compatible Sensors (choose two

Used with: pHotoFlex pH colorimeter

Expandable Well Caps photometer or ISE & Specialty SensorsThe Expandable Well Cap is designed to provide a secure, watertight seal inside monitoring and observation well casings. Ideal for environmental monitoring, groundwater sampling, and remediation projects, the expandable plug helps protect wells from surface water intrusion, debris, and unauthorized access while preserving sample integrity. Manufactured from durable glass filled nylon with a Buna N gasket, stainless steel locking lever, and brass wing