Model 3 / commonly used plastic cooling pipe 4, 1/2 and 3/8 and a quarter. Theirstandard general 1/2 and 3/8 are 410 mm long, a quarter is usually 280 mm, 3/4generally is 400 mm. Plastic cooling pipe by manually assembling the product,can be arbitrary adjust the use length, use direction, nozzle diameter size ofcircle flat swaps, can also according to customer's requirements with tee,switch and magnetic.