Please note that this product is "made to order". Therefore an order cannot be canceled or returned even if delivery times are longer! Ideal for sub-surface liquid sampling 500mL capacity These units are constructed of corrosion resistant Type 304 stainless steel A weighted plunger with a FKM ''O” ring seals the reservoir chamber at the bottom Use a cable to lower sampler to desired depth Pull second cable to operate the sampling valve and release to reseal the chamber Cables not included Recommended for use with a cable that can support 50 pounds or more and is made from stainless or PTFE coated stainless steelMeer tonenMinder tonen