1. Compatibility: the skimmer vacuum plate is designed with 1-1/2-inch straight adapter, compatible with Pentair HydroSkim skimmer 513330 and Hayward SP1091WM, and the spiral pool vacuum hose cuff that is suitable for 1-1/2-inch spiral wound pool vacuum hoses; Please check whether the size and model are suitable before purchasing 2. : the pool vacuum skimmer plate with rubber gasket will not need to connect the vacuum hose directly to the inlet, just connect it to the vacuum hose located above the skimmer basket, it will begin vacuuming, and when you are using the vacuum hose threaded cuff, just slip the cuff around the exposed hose end and tighten it 3. Package Content: you will receive 1 piece of vacuum plates for pool skimmer and 1 piece pool hose cuff( Figure 1), the diameter of the pool skimmer plate is 20 cm/ 7.87 inch, and the top interface width is 3.2 cm/ 1.26 inch, the height is 7 cm/ 2.76 inch, 1 piece of the pool vacuum hose cuffs, the height is 10 cm/ 3.9 inch, the size of the top interface is 3.8 cm/ 1.5 inch, and the size of the source nipple is 4.7 cm/ 1.8 inch; Manual measurement, please allow for errors 4. Reliable Material: the skimmer adapter for vacuum hose is made of quality plastic material, and the spiral pool vacuum hose cuff is made of PE material, and reliable, which can be applied for a long time, and you can clean the pool better, ideal pool cleaning tools accessories