Pump impeller : The pump impeller is made of rubber or metal,and the metal liner and rubber liner are interchangeable .The back vane can reduce the sealing pressure ,and it can also cut down backflow to the largest extent at the same time .On the other hand ,cast-in impeller threads are more suitable for slurry . As a China-based pump impeller manufacturer and supplier ,Tech-macro also provides abrasion resistant slurry pump ,froth pump ,dredge pump,and sump pump with rubber liner ,among others .