Double gully is two rain together. Grate in the past generally refers to the cutting and grinding of bamboo is good, and the two layer are buckled together, frame in the pot, kettle, Ding and other cooking utensils used for food, steamed stew cooking, is round. Now there are some polymeric materials, made of iron, aluminum, stainless steel and alloy materials grate, added a border, called Longti. Here, the main role is to support the grate, food, water vapor and heat for better absorption of food.

In addition, the grate also in water supply and drainage facilities equipment name, mechanical equipment name, such as the manhole cover can be called hollow grate, pipe with metal mesh filter impurities can be called grate, filter tap on the head can also be called grate, metal mesh on the fuel tank is also called grate. Here, the effect is mainly grate, filter.

Rain Olivier installed three points: first, to ensure the fundamental strength requirements in the installation must be placed before the rain Olivier, cement foundation, and then it will rain Olivier installed. Second: after installing rain Olivier, to the fastening screw arranged on the bottom in the box around, also should be filled with cement mortar, prevent for a variety of reasons lead to falling rain olivier. Third: according to the actual situation, the installation of any shape eccentric rain Olivier, meet the actual requirements.