How to ID Threads

Standard vs. S.A.E Threads
As you can see in this graphic, when looking at a filter's threads from the side the difference is very obvious. Standard, sometimes called "MPT" or "Male Pipe" threads are smaller and have a higher number of threads than the S.A.E. style. The S.A.E. threads are large and square in nature almost resembling a child's toy.

Adaptor
Pleatco’s unique adapter design makes installation and replacement of filter cartridges easy for the end user. Many filters require a threaded extension at the base of the cartridge to screw into the filter housing. Because the end cap material can become soft, the thread can easily strip or crack if the cartridge is pulled when being removed. Pleatco’s Adapters (PAD) are manufactured using a harder material than the end cap which eliminates the problem.

Once installed, the adapter can be re-used at the time the filter cartridge has to be cleaned or replaced and reinstallation is far quicker and easier due to the modular design of the adapter. With a half turn of the filter element, it is easy to remove it from the spa without the fear of cracking the end cap. Because the Pleatco Adapter remains in the filter housing, once the cartridge has been disengaged and removed, there is a far lesser instance where dirt and objects may fall into the exposed opening and damage the pump.

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