Seal: Black NBR seal characteristic 1: The surface iron can be plated with white zinc, and the iron can be plated with yellow zinc 2: 22 and 23.5 standard mud joints are available Mud joints are widely used in construction mortar pumps, sprayers and plasterers to convey mortar, concrete. The shape of the mud joint is similar to that of a quick coupling, but the maximum workmanship The pressure and material are different, and the two are not interchangeable. The mud joint is connected with the hose through the crimping sleeve, which is safe and reliable; Grooved slurry is also available upon request Fittings, which allow for quick assembly with safety clamps.