Product Description LPF-D3.15 type floating ball controller is a switch that can adjust the barrel,slot and the liquid level in the well.it can be adjusted by itself,easy to operate and install,safe and reliable, free maintenance,no harm to environment and resistant to sewage.The product is confirmed by Zhejiang province insustrial product test center to meet the standard of Q/QLP0001-2002,and is widely applied in water pool,oil,weak acid or weak alkali pools,barrel,slot,and jar that are used in family,factory,and mine etc,and especially,it is applicable to the containers with small caliber (effective to more than 6cm) Construction: After fixing the switch.use the thread to lay a heavy hammer on the highest desired liquid level,and then,use the thread to lay another heavy hammer on the lowest desired liquid level.(Noted:keep the hammer no touch with the bottom of container)