RainHarvest Systems – Rainwater Collection and Stormwater, Harvesting rain is a practice that has been around for centuries. Cisterns and other rain harvesting systems are widely used in Europe, Australia, India, the Bahamas and countless remote countries – many who depend solely on rain for day to day life. When water supply becomes limited, practical solutions can fill the gap.
Build-It-Solar, Build It Solar will help people with Do It Yourself skills build solar projects that save money and reduce pollution. It is a "hands-on" site with detailed plans for solar projects including solar space heating, water heating, passive solar home design, solar pool heating, solar cooking, photovoltiacs, wind generators, and others.
Oberdorfer Gear Pumps – store.waterpumpsupply, A gear pump uses the meshing of gears to pump fluid by displacement. They are one of the most common types of pumps for pumping oil. Gear pumps are also widely used in chemical installations to pump fluid greater viscosity. There are two main variations; external gear pumps which use two external spur or helical gears, and internal gear pumps which use an external and an internal spur gear.