What you need to do to swap out a pool skimmer
Replacing an above ground pool skimmer takes two to four hours and requires only basic tools — a screwdriver, adjustable wrench, and a bucket. You will turn off the pump, drain the water level below the skimmer, unbolt the old skimmer from the pool wall, disconnect the hose, install the new one in reverse order, and refill. Most homeowners can do this without calling a technician, and the part itself costs between $40 and $150 depending on the pool size and skimmer type.
The skimmer is the box mounted on the pool wall that pulls water and debris into the filter system. When it cracks, leaks, or the basket mechanism fails, the whole unit usually needs replacement rather than repair. The job is straightforward because the skimmer bolts to the wall from the outside — you do not have to drain the entire pool or break into the plumbing.
Key Takeaways
- Turn off the pump and lower the water level to below the skimmer opening before you start any work.
- The skimmer bolts to the pool wall from outside; you will unbolt it, disconnect the intake hose, and slide the new one into place.
- Measure your pool wall thickness and the distance between bolt holes so you order the correct replacement skimmer.
- Refill the pool slowly after installation and run the pump for 10 minutes to check for leaks before you leave it unattended.
Measure your pool wall and order the right skimmer
Before you remove the old skimmer, write down three measurements: the thickness of your pool wall (usually 0.5 to 1.5 inches for above ground pools), the distance between the two bolt holes on the face of the skimmer, and the diameter of the intake port where the hose connects. Take a photo of the old skimmer's label or model number if it is still readable. These details matter because skimmers are not universal — a skimmer designed for a thin vinyl wall will not seal properly on a thicker wall, and the bolt spacing varies by brand.
Order a replacement that matches your pool type and wall thickness. Most above ground pool retailers (online or local) can cross-reference your old model or help you match by wall thickness and bolt pattern. If you cannot find the exact model, bring the old skimmer to the store and let them compare it side by side with options. Buying the wrong size means a second trip and wasted time.
Turn off the pump and lower the water
Switch off the pool pump at the breaker or control panel. Do not just turn a valve — you need the pump completely off so no pressure builds in the lines while you work. Wait five minutes for any residual pressure to release.
Use a submersible pump or siphon to lower the water level until it sits about six inches below the skimmer opening. This gives you room to work and prevents water from pouring out when you disconnect the intake hose. If your pool has a drain valve at the bottom, you can use that instead, but it will take longer and you will lose more water than necessary.
Remove the old skimmer from the wall
Look at the face of the skimmer (the part you see from outside the pool). You will see two or four bolts holding it to the pool wall. Use your adjustable wrench or socket set to unbolt these fasteners. Keep them in a small container so you do not lose them — you may reuse them or need them as reference for the new skimmer's bolt size.
Once the bolts are out, gently pull the skimmer toward you. It will slide out of the wall opening. You may need to wiggle it slightly if it is stuck, but do not force it — if it will not budge, check that you have removed all bolts and that no hose clamps are still attached.
Locate the intake hose that runs from the skimmer into the pool plumbing. Loosen the hose clamp (usually a metal band tightened with a screw) and slide the hose off the intake port. Have your bucket ready — there will be water in the hose. Let it drain into the bucket.
Install the new skimmer
Before you push the new skimmer into the wall opening, dry the opening and check that the rubber gasket or foam seal on the back of the new skimmer is clean and not cracked. If it looks damaged, do not install it — contact the retailer for a replacement.
Slide the new skimmer into the wall opening. It should fit snugly but not require force. Align the bolt holes on the face with the holes in the pool wall. Insert the bolts and tighten them in a cross pattern (top-left, bottom-right, top-right, bottom-left) so the pressure is even. Tighten firmly but do not over-tighten, which can crack the skimmer or strip the bolts.
Reconnect the intake hose to the new skimmer's intake port. Slide the hose onto the port and tighten the hose clamp with a screwdriver. Make sure the clamp is snug enough that the hose will not slip off under pressure, but not so tight that you crush the hose.
Refill and test for leaks
Turn the water back on and refill the pool slowly. Watch the skimmer area for leaks as the water level rises. If water is dripping from the bolts or from where the skimmer meets the wall, turn off the water, let it drain, and check that the bolts are tight and the gasket is seated properly. Small drips often stop once the water pressure stabilizes.
Once the water level is back to normal (usually one-third to one-half way up the skimmer opening), turn the pump back on. Let it run for 10 minutes and watch the skimmer intake and the hose connection for leaks. If everything is dry, you are done. If water is still leaking, turn off the pump, lower the water again, and re-examine the hose clamp and bolt tightness.
Common problems during replacement
The most frequent issue is a hose that does not fit the new skimmer's intake port because the diameter is slightly different. If your old hose is too loose or too tight on the new port, you will need an adapter or a new hose. Measure the old hose's inner diameter and the new skimmer's port diameter before you finish — it is easier to swap a hose while the water is still low than to drain again later.
Another common problem is over-tightening the bolts, which can crack the plastic skimmer body or strip the bolt holes. Tighten until snug, then stop. You do not need to muscle it. If a bolt spins without tightening, the hole may be stripped — contact the retailer about a replacement unit or a repair kit.
Water leaking from the gasket usually means the gasket is not seated evenly or the pool wall is not flat. Remove the skimmer, inspect the gasket for debris or damage, clean the wall opening, and reinstall. If the wall is visibly warped, you may need a thicker gasket or a custom seal — ask the retailer whether they stock oversized gaskets for your pool model.
Frequently Asked Questions
Can I replace the skimmer without draining the pool?
You must lower the water below the skimmer opening, but you do not have to drain the entire pool. Lowering it six inches below the skimmer is enough. If you try to remove the skimmer with water above it, the water will pour out and you will lose control of the situation.
What if the new skimmer does not fit the bolt holes?
Measure the bolt spacing on both the old and new skimmer before you buy. If you have already bought it and the spacing does not match, contact the retailer — they may exchange it or provide an adapter plate. Do not try to drill new holes in the pool wall.
How long does the pump need to stay off?
Keep it off for the entire replacement process, which usually takes two to four hours. Once you have refilled the pool and checked for leaks, you can turn it back on. There is no harm in leaving it off overnight if you finish late in the day.
Do I need to replace the intake hose too?
Only if the old hose is cracked, kinked, or does not fit the new skimmer's port. If it is in good condition and the diameter matches, you can reuse it. Hoses last many years if they are not exposed to direct sunlight.
What should I do if water leaks from the bolts after I refill?
Turn off the water, let it drain below the skimmer, and tighten the bolts in a cross pattern again. Most small leaks stop once the bolts are fully seated. If tightening does not work, the gasket may be damaged or the wall may be uneven — you may need to remove and reinstall the skimmer with a new gasket.