Intex 1.25" to 1.5" Pool Hose Adapter Review
If you're upgrading the filter pump on an above-ground pool, there's a good chance you'll run into a surprisingly simple problem:
the new hoses are bigger than the fittings on the pool.
Many smaller above-ground pools are supplied with a compact cartridge filter pump using 1.25-inch hoses and clamp-on connections.
Move up to a larger cartridge pump, sand filter or some saltwater systems and you'll often find 1.5-inch threaded hoses instead.
That's exactly what the Intex Type B Hose Adapter is designed to solve.
The adapter allows a pool with a compatible 1.25-inch clamp-on fitting to connect to the larger 1.5-inch threaded hose used by many upgraded filtration systems.
The Amazon set reviewed here includes two adapters, which is useful because a typical filter upgrade requires one connection for water leaving the pool and another for the filtered water returning.
Quick Verdict
The Intex Type B adapter is one of those inexpensive pool parts that can solve a very specific, and very common, upgrade problem.
If your pool uses 1.25-inch clamp-on fittings but the new pump or filter system has 1.5-inch threaded hoses, this adapter lets you bridge the two without modifying the pool wall.
That's particularly useful when moving from a small factory-supplied cartridge pump to a larger cartridge or sand-filter system.
Intex itself says Adapter B is needed when upgrading from its smaller 530 or 1,000 GPH filter pumps to a 1,500 GPH or larger system. Its smallest current SX1500 sand filter also comes with two 1.5-inch hoses.
Best for: Pool owners upgrading from 1.25-inch fittings to a filter, pump or saltwater system using 1.5-inch threaded hoses.
Skip it if: Your pool already has 1.5-inch threaded fittings, or your existing wall fitting isn't compatible with the adapter's 1.25-inch clamp-on side.
Intex Type B Adapter Specifications
Don't think of this as a generic hose reducer. Its main job is to let a larger 1.5-inch threaded filter hose connect to a compatible pool wall fitting designed for a smaller 1.25-inch clamp-on hose.
Why Would You Need a 1.25" to 1.5" Pool Adapter?
A very common above-ground pool upgrade looks like this:
You buy a pool with a small cartridge pump already included.
The pool wall uses 1.25-inch fittings and the original pump uses smaller 1.25-inch hoses.
After using the pool for a while, you decide you want better circulation or easier filtration and upgrade to a larger cartridge filter or sand-filter pump.
The new system arrives with 1.5-inch threaded hoses.
Now the pump and filter may be exactly what you wanted, but the hoses don't match the existing pool fittings.
That's where Adapter B comes in.
It allows you to keep the smaller pool wall fitting while giving the larger threaded hose somewhere suitable to connect.
For many owners, that's considerably easier than modifying or cutting the pool liner to install larger wall fittings.
Yes — Even the Intex SX1500 Uses 1.5-Inch Hoses
This is a useful example because the SX1500 is currently Intex's smallest sand-filter pump in this range.
Even that system includes two 1.5-inch (38 mm) connector hoses. Intex also notes that the 1.5-inch outlet fittings/plunger valves aren't included with the pump.
So if you're upgrading a smaller pool that originally came with a 1.25-inch cartridge system, the hose-size mismatch can appear even when you're buying the smallest Intex sand filter.
That's exactly the type of situation these adapters are designed for.
If you're considering that upgrade, our Intex SX1500 Sand Filter Pump review covers the filter itself in more detail.
How the Adapter Connects
You aren't cutting hoses or forcing both hose sizes over barbs.
The smaller side of the adapter clamps onto the pool's compatible 1.25-inch fitting.
The larger side gives you the threaded connection for the 1.5-inch hose from the upgraded filter system.
In a normal pump-and-filter upgrade, you'll generally need two adapters:
Pool suction fitting → Adapter B → 1.5-inch hose → pump/filter
and
Filter return hose → Adapter B → pool return fitting
That's why the two-pack makes sense for a complete conversion.
Do You Need to Cut the Pool Liner?
Usually, not if your existing fittings work with Adapter B.
Some owners choose to enlarge their pool's openings and install full 1.5-inch threaded wall fittings when carrying out a more permanent filtration upgrade.
That can create a neater full-size plumbing setup, but it is a considerably more involved modification.
The whole appeal of this adapter is that many owners can connect a larger filter system while leaving the original smaller pool fittings in place.
For someone who simply wants to upgrade the pump or filter without cutting the liner, that can be a big advantage.
Can You Use These on Bestway and Coleman Pools?
Potentially, yes, and this is worth explaining because the Intex branding can make the product look more brand-specific than it really is.
The important question isn't simply whether the pool says Intex, Bestway or Coleman.
It's whether the pool has a compatible 1.25-inch clamp-on fitting that the adapter can seal around properly.
There are many owner reports of Adapter B-style fittings being used successfully when fitting larger Intex pump and filtration systems to Bestway, Coleman and other soft-sided above-ground pools. Leslie's also specifically lists its equivalent Adapter B as suitable for Bestway and Intex pools.
We would still check the actual fitting before buying rather than promise compatibility based purely on the pool brand or diameter.
Useful for Sand Filters, Larger Cartridge Pumps and Saltwater Systems
Although filter upgrades are probably the clearest use case, Adapter B isn't limited to sand filters.
It can be useful whenever your existing pool fitting is 1.25 inches and the new equipment uses a 1.5-inch threaded hose.
That can include:
larger cartridge filter pumps
sand-filter pumps
saltwater-system installations
some replacement pumps and custom circulation setups
If you're still deciding what to upgrade to, our Best Sand Filters for Above-Ground Pools and Best Cartridge Filters for Above-Ground Pools guides compare the systems we'd choose for different pool sizes.
Intex itself describes the adapter as being for upgrading to a 1,500 GPH or larger system, and the Amazon product is sold for pumps and saltwater systems.
What We Like About the Intex Type B Adapter
It solves a genuinely common upgrade problem. You don't have to abandon a larger filter system just because your pool still has smaller fittings.
The pair is useful. Most full pump/filter conversions need an adapter on both the suction and return side.
It can avoid cutting the pool liner. That's a significant advantage if you want a reversible, less invasive upgrade.
It isn't limited to sand filters. The same size conversion can be useful for larger cartridge pumps and saltwater-system plumbing.
Cross-brand use is possible. Compatible Bestway, Coleman and other soft-sided pools can often use this type of fitting even though it carries the Intex name.
What We Don't Like
Compatibility isn't universal. “Bestway compatible” or “Coleman compatible” doesn't mean every pool from those brands will accept it.
It doesn't convert the whole pool to true 1.5-inch plumbing. You're still retaining the smaller wall fitting, so this is an adapter solution rather than a complete plumbing conversion.
You need to check the connection type as well as the diameter. Two fittings can both be described as roughly 1.25 inches without necessarily having exactly the same shape or sealing method.
It's easy to buy the wrong adapter online. There are several similar-looking Intex fittings and aftermarket copies, so check that you're buying the Type B 1.25-to-1.5-inch conversion adapter.
Who Should Buy These Adapters?
These make the most sense if you:
have an above-ground pool with compatible 1.25-inch clamp-on fittings
are upgrading to equipment with 1.5-inch threaded hoses
want to keep the existing pool wall fittings
need both suction and return connections converted
are fitting a larger cartridge pump, sand filter or compatible saltwater setup
For that buyer, this is a very simple solution to a problem that can otherwise stop a filter upgrade in its tracks.
Who Should Skip Them?
You don't need these if your pool already has proper 1.5-inch threaded wall fittings.
They also aren't the right solution if you're deliberately converting the pool itself to full-size 1.5-inch fittings.
And if you're buying them for a Bestway, Coleman or another non-Intex pool, check the actual wall fitting first rather than ordering purely because another owner with the same brand said theirs fitted.
Our Final Verdict
The Intex Type B hose adapter isn't an exciting pool accessory, but for the right setup it can be one of the most useful.
Its real value appears when you're ready to stop using the small filter system supplied with the pool and move up to something more capable.
A larger cartridge pump or sand filter may use 1.5-inch threaded hoses even though the pool itself still has the smaller 1.25-inch clamp-on fittings.
These adapters bridge that gap.
We especially like them as a non-invasive upgrade option because they can let you install a larger filtration system without immediately cutting or permanently modifying the pool wall.
Just don't assume compatibility from the brand name alone.
If the pool fitting is the correct style and size, the Intex Adapter B is a simple, inexpensive way to connect the larger filtration equipment.
Frequently Asked Questions
What does the Intex Type B hose adapter do?
It allows a compatible 1.25-inch clamp-on pool fitting to connect to a larger 1.5-inch threaded pump or filter hose.
Why would I need a 1.25-inch to 1.5-inch pool adapter?
They're commonly needed when upgrading from a small factory-supplied cartridge filter pump to a larger cartridge pump, sand filter or other system that uses 1.5-inch hoses.
Does the Intex SX1500 use 1.5-inch hoses?
Yes. Intex currently supplies the SX1500 with two 1.5-inch (38 mm) connector hoses.
Do I need one adapter or two?
A typical complete pump/filter upgrade uses two: one for the suction side and one for the return side. The Amazon set reviewed here contains two adapters.
Will Intex Type B adapters fit a Bestway pool?
They can fit compatible Bestway pools that use the appropriate 1.25-inch clamp-on wall fitting. Compatibility should be checked from the actual fitting rather than the brand name alone.
Will they fit a Coleman above-ground pool?
Many owners have successfully used this style of adapter with compatible Coleman pools, but fittings differ between models. Check the existing connection dimensions and style before buying.
Do I need to cut my pool to install a larger sand filter?
Not necessarily. If your existing 1.25-inch fittings are compatible with Adapter B, the adapters can allow 1.5-inch filter hoses to connect without enlarging the pool-wall openings.
Can I use these adapters with a saltwater system?
Yes, where the equipment and pool fittings use the relevant 1.5-inch and 1.25-inch connection sizes. Intex sells Type B adapters for pump and saltwater-system upgrades.
More Filtration & Pump Help
Upgrading your above-ground pool filtration system? Visit our Filtration & Pumps hub for sand and cartridge filter reviews, pump sizing help, filter-media guides and compatibility advice.
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