The Solinst Integra Bladder Pump allows consistent, high quality samples in all types of applications. It offers excellent performance and reliability. It is designed to meet the most rigorous US EPA standards for groundwater monitoring. The Teflon* bladder ensures that drive air or gas does not contact the sample, thus avoiding degassing or contamination of the sample. Integra Pumps are rugged and long lasting. The Teflon bladder has a 10 year warranty. Both bladders and intake filters are easily replaced in the field in just a few minutes. Solinst offers 1.66" diameter (42mm) Integra Pumps in 316 stainless steel or PVC, in 2ft. and 4ft. lengths (610mm and 1220mm). Stainless steel Integra pumps are ideal for low flow sampling or regular flow sampling from lift depths up to 500 ft. (150m) below grade. The 1.66" PVC Integra operates up to 100 ft. (30m) below grade and the 1" (25mm) stainless steel Integra operates to depths of 250ft. (80m).