Compatibility : The vacuum skimmer adapter for - compatible with 1.5inch connections on RP or RX filter systems. For the suction fitting for 1.5inch hose connections. For existed pool adapter for floating skimmer. (The old and models of swimming pool have different interface size , in order to save unnecessary consumption, please measure the adapter to confirm what you need and then purchase.) Vacuum Adapter RP/RX Skimmer Attachment : Designed for above ground pool. This wall vacuum adapter for RP/RX skimmer filter system which helps keep your above ground pool sparkling clean. This skimmer adapter compatible only connections on RP or RX filter systems. Easy to Install : This pool skimmer vacuum adapter attachment for can be easily installed, you'll simply screw on this adapter to your suction housing in your pool and vacuum adapter can start working. Precautions&Size : Vacuum adapter rp/rx skimmer attachment, the 3.6 inch diameter internal thread is connected to the pool suction port, and the small diameter with 2 O-rings is connected to a 1.5 inch hose.(See Figure 2) In order to use it correctly and avoid purchase errors, please check whether the product matches your pool adapter at the time of purchase. : Our vacuum adapter for skimmer attachment is made of plastic and is well made. And comes with 2 O-rings for a tighter connection, allowing your skimmer to run at efficiency. Colour:white Material:plastic Package Contents: 1 x Vacuum Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.