You can also send pictures and measurements of your existing filter to assure correct replacement if you are unsure about the model number.

What Is FPTthread

For more info about GC4425 (P25) and GC4415 (P15) Steel Turning Insert Grades call 1-800-323-TOOL (8665) to speak with a Steiner metalworking representative.

Some Pleatco filters have a removable threaded connector which can be unscrewed, while other filter brands and types have the connector molded to the filter end cap.

The new-generation steel turning insert grades GC4425 (P25) and GC4415 (P15) deliver improved performance in every way. Coated with second-generation Inveio® technology, they have a broad range of applications and are recommended for continuous and interrupted cuts.

MPTmeaning in business

Enter your filter model number in the search box above or find your filter by dimensions. Have a question? Email us at info@spafilters.ca.

To make matters a little more confusing, the same threads may be offered as a female connector instead of the male connector. (FPT = female pipe thread).  (For a full explanation, you can read the Wikipedia article.)

Pleatco Removable Threaded Adapter If your spa had an old Pleatco filter in it, chances are it had a removable threaded adapter fitting.  These little male pipe threaded fittings fit into a slightly smaller than 2″ diameter opening.  Since most new replacement filters have the threaded connector on them, you won’t need that adapter but should remove it if it is still inside.er

NPTthreadchart

Identifying Filter Thread Size Threads can be identified by visual inspection or even by a caliper tool.  Once you know the type of thread your hot tub filter has, you won’t need to know this again.  Just be sure to order the correct filter thread type (fine = MPT or coarse = SAE) and whether the connector is a male connector or a female connector.

FPT vs NPTthread

Once you identify the filter model number, you won’t have to measure your filter anymore, simply reorder with the filter model number.

1/2mpt

Female Threaded Connector Measurements (SAE-F) Note the female threaded socket size is listed as a nominal pipe thread size of 1-1/2″, but that is not the actual measurement of the inside diameter.  This  1-1/2″ coarse threaded socket actually measures about 1-7/8″ inside diameter (I.D.) for your reference.

First-choice grade GC4425 (P25) features improved wear resistance, heat resistance and toughness, significantly expanding the application range. Grade GC4415 (P15) complements GC4425 (P25) when more heat resistance is needed. It allows for high cutting speeds and long times in cut when machining in stable conditions.

Spa filter threads usually come in either 1 1/2″ or 2″ fine (MPT) or 1 1/2″ or 2″ coarse (SAE) threads.  The actual diameter of the threaded connector is actually 1/4″ larger than that specified when measured.  So the 1 1/2″ male pipe thread connector would actually be 1 3/4″ wide.

**Local pickup is not available but we do ship from various warehouses across Canada. SpaFilters.ca offers the largest selection of hot tub filters that are shipped from/stocked in a variety of locations across Canada, often by third party vendors that offer the best prices and deals on hot tub filters in Canada.

Threaded connector? Be sure to order either mpt (fine) thread or sae (coarse) thread type. See our blog post on threaded filters for more.

Are NPT andMPTthreads compatible

Sustainable Steel Turning An average of 25% tool life increase combined with a reliable and predictable performance helps minimize both insert and workpiece material waste, necessary preconditions for sustainable machining. Moreover, its carbide substrate contains a high proportion of recycled carbide material, making them one of the most environment-friendly grades.

MPTvs MIP

The Steiner Metalworking application team can assist you with selecting the right inserts for your steel machining requirements and provide guidance on process improvements for higher yield rates and cost reductions. For assistance, call 1-800-323-TOOL (8665).

The longer explanation is more complicated, but for hot tub filter applications, there are mainly either fine threads or coarse threads (if the filter has a threaded connector at all).

In a wider sense, MPT is the same as NPT which stands for National Pipe Thread Taper.  That is the United States standard for tapered threads on fittings and pipes. The connector on the right is an MPT spa filter connector. (MPT = male pipe thread)

Toughness and Wear Resistance Combined New substrates with a unique combination of good toughness and resistance against plastic deformation offer a reliable performance. The cobalt enriched surface gradient adds to security.

Find your filter by entering the filter model in the search box above or get the model number by measuring your old filter and search by filter dimensions.

MPT threadvs NPT

New Post-Treatment Improved post-treatment lifts the performance in intermittent cutting operations. The bright yellow top TiN coating on the insert flank allows for easy wear detection.

Second Generation Inveio® Technology With the introduction of the second generation Inveio® technology, the benefits of uni-directional coating have been further developed. Improved crystal orientation makes for an even more consistent performance and significantly improved wear resistance and tool life.