Solinst Model 615ML Multilevel Systems (c/w barbed fitting) 

Key Features

• 100 micron mesh stainless steel screen
• 6" port with 1" tip at bottom port or extension
• Compatible with 3/8" or 1/4" OD LDPE or PTFE tubing

Overview
The 615ML Multilevel Drive-Point Ports have a dual barb stem to allow the connection of 3/8" OD (9.5 mm) or 1/4" OD (6 mm) tubing. The 615ML uses the same couplings and extensions as the standard 615 Piezometers, but with a Drive-Point Tip to thread onto the first extension or Port. Formation water enters the port, passes into the stem, and up into the monitoring tube attached to the stem to its static level. The 615ML is also a good option for high-resolution profiling of soil, gas, or groundwater.