MUELLER STREAMLINE 1/2 in. Sch. 40 PVC Pressure 45-Degree Slip x Slip Elbows are designed for use in cold-water pressure systems and are great for irrigation. Common applications include cold-water lines, shrub beds, plant and flower beds, gardens, swimming pools and spas. Changes the direction of Sch. 40 PVC piping by 45 degrees.