Remove any duct tape being used with the Shop Vac. If using a Shop Vac, now is the time to turn it off and remove the vacuum hose from behind the liner. Applying outward pressure to the return fitting cut and X in the center of the exposed liner from outside the pool. If the SP1091E, Wide mouth extension, is not installed on the body, it must be assembled to the body prior to attempting to install the skimmer in the pool. Once level, continue to fill and adjust the liner as needed until you have about 6 of water in the pool so the liner is under weight and stretched to the proper position. Carefully push the screws through the holes that have been pierced in the liner and through the double gasket. Insert two screws into the upper two corners of the skimmer faceplate. Using your fingers on top of the liner, locate the two top corner holes of the skimmer gasket from the inside of the pool. Don't tighten any of the screws until allthe screws are in place. Once all the screws have been added, go back and tighten each one. Screw on the lock nut and tighten. If you plan to use a garden hose to add water to the pool, check the metal nozzle to make sure there are no sharp edges that could damage your liner. To install the wide mouth extension, insert four (4) pan head screws 1 long through the lip of the extension and four (4) through the throat of the skimmer. Locate the skimmer and vacuum port gaskets. 
Place the gasket between the extension and the skimmer body. The liner cannot be shifted after the skimmer and return holes have been cut. Firmly tighten all screws evenly, alternately left and right, top and bottom. Using a blunt object, pierce the remaining holes in the liner. PRO TIP:A good setting for your cordless drill (if using) is a 10, possibly an 11 if you're working on a colder cloudy day (the liner will not give as much when not warm). Line them up with the two holes you just pre-punched, and press the screws into the holes you made. From the outside of the pool install the face-plate double gasket at skimmer cutout in the wall. These items are designed for the pool wall to sit in between the flaps of the gasket to form a seal and prevent leaks around the skimmer and cleaner port. Attach the vacuum port cover to the skimmer faceplate. Secure the top two corners of the skimmer to the pool wall using a handheld or cordless drill. Next add your cleaner port gasket to the smaller hole in the pool wall just under your skimmer opening. 
Installing these items ahead of time may cause the liner to rip away from the opening as the water pulls down on the liner. PRO TIP:Overlap liners should be monitored to make sure they aren't being overstretched. Using the skimmer face plate as a guide, use a razor knife to trim only the liner, being careful not to the gasket, in the large. For this tutorial, we are using an Embassy Skimmer from H.I.I. The screw holes should be lined up perfectly once your top two screws are secured. 
The return fitting will now be fully pressed against the liner and the wall on the inside of the pool. Punch out the two top corner holes using a blunt object. Start filling the pool with water (with the Shop Vac on if using one). Be cautious not to over tighten the screws as the skimmer and weir are plastic and can crack under too much pressure. From the outside of the pool, align the skimmer body with these screws. Once you have about 6 inches of water in the pool, you can release any tension on the wall vinyl by removing and reinstalling the Coping Strips one at a time. Add your skimmer basket into the skimmer and the lid to the top opening. PRO TIP: Using a handheld screw driver for this can beeasierthan just trying to push the screw through the liner by hand. PLEASE NOTE WHICH SKIMMER YOU HAVE AS THERE ARE SPECIFIC INSTRUCTIONS BELOW FOR CERTAIN SKIMMERS. Firmly tighten the screws. 
If so, file them down or cover them with duct tape prior to adding the hose to your pool. Continue filling the pool, stopping to adjust the liner if any wrinkles develop. 
The return fitting furnished with these skimmers is a SP1023. DO NOT CUT THE LINER. Carefully cut the liner out from the inside of the skimmer's faceplate. If water runs to one side, pull back the liner from the pool wall and make the ground level with sand or sifted earth. When putting gaskets on the pool wall, work carefully as the edges of the wall are sharp. Your skimmer installation is now complete! Do not over-tighten. Start by putting the first screw in the middle hole and tighten it using a drill or screw driver. Place the second rubber gasket and then the cork gasket over the threads of the return fitting now exposed outside of the pool. Insert and lightly tighten the remaining flat head screws through the face-plate, liner, gasket and into the corresponding holes on the skimmer.
Pre-punch those two holes in the liner using the screws provided. Insert two self-threading flat head screws (provided) into the top corner holes of the faceplate. Screw on the adjustable directional ball fitting into the face of the return fitting from the outside of the pool. Have someone help you by holding the skimmer up to the outside of the pool wall and line up the top two corners with the ones on the pool wall. Or view our guide on the 17 steps to installing your Round Above Ground Pool here. Lightly tighten the two screws. This will help keep the faceplate in place while you add the skimmer. Next, you'll need to have a sharp razor blade or box cutter. You will want to adjust these as you go. Once your first screw is through the liner, remove it and puncture the second hole, on the other top corner of the skimmer gasket. The skimmer should be secure enough on the wall so you can finish adding the rest of the screws yourself. Reach over the top rail of the pool and carefully press the face-plate and liner against the gasket and skimmer cutout in the wall.
WARNING! Place one rubber gasket over the threads of the return fitting adapter and push the threaded end against the liner and through the return cutout in the wall. When the water is no more than 1" deep, check if the pool is level. manufacturer of Doughboy Pools. After the skimmer gasket is on make sure all the holes on the gasket are lined up with the holes on the pool wall. Do not cut the skimmer and return holes in the liner until fully adjusted and the pool is 1/3 filled. Didn't find the answer you were looking for? Do not install faceplates, inlets, light fixtures, etc. Position ball fitting opening away from skimmer opening. 
The hole required through the pool wall to install this fitting is 2.38.03 inches.
Do the same for the inside of the vacuum cleaner port. You can alwayscontact usat support@royalswimmingpools.com or choose the category below to see our most frequently asked questions for that topic: How to Add Water and your Skimmer to your Above Ground Pool, Click here if you have the Hayward SP1091LX or SP1091WM (Hayward Wide Mouth Skimmer), Click here if you have an Embassy Model 0-20901-013 or 0-2091-015, How to Secure the Vertical Supports on your Above Ground Pool, For all other skimmer types continue reading. until the water reaches 3 below the specific opening. Using a razor knife, trim the excess liner material from around the fitting threads on the outside of the pool. Make sure to remove the screws from these holes before continuing.