The inner wall stays smooth because the solid brass can't rust or pit. As a result, the leathers last and last. Twin leathers for higher efficiency. Tough urethane facing on check valve. Passed tests simulating use at 3,000 foot Depth! Can withstand temperatures up to 200°F. (Important if you're pumping from geothermal spring.)

• A size for any need - choose a wide cylinder for high volume or a narrow one for more depth
• Cylinders are 18"L
• Cylinder rebuild kits include leathers and all other replacement gaskets