This extension lets you sample 3 feet deeper than the length of your sampling tube. (6 feet with a 3 foot tube) If you want to sample deeper than that you will need to purchase one or more JMC ESP Plus Regular Extensions in addition to this extension.
Replacement liner for JMC Environmentalist's Sub-Soil Probe's 48 inch Sampling Tube available at lower prices when purchased in larger quantities. Click on details for more information.