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Watkins Spa Filters
These Filters Meet or Exceed Specifications Set Forth By This Spa Manufacturer.
 
Square Feet
Outer Diameter
Length
25/40
6 3/8"
11 7/8"
Shopping Options
Top
Bottom
3" Inner Dia
3" Inner Dia
Same as:
Unicel - C-6600
Filbur - FC3930
Spa Filter
Spa Filter
Item# PWK25-4    Models After 1990

Square Feet
Outer Diameter
Length
30
6"
10 1/2"
Shopping Options
Top
Bottom
1 15/16" Inner Dia
1 15/16" Inner Dia
Same as:
Unicel - C-6430
Filbur - FC3915
Spa Filter
Spa Filter
Item# PWK30

Square Feet
Outer Diameter
Length
30
5 1/8"
10 1/4"
Shopping Options
Top
Bottom
1 15/16" Inner Dia
1 15/16" Inner Dia
Same as:
Unicel - C-5431
Filbur - FC3910
Spa Filter
Spa Filter
Item# PWK30-220V

Square Feet
Outer Diameter
Length
25
4 5/8"
16"
Shopping Options
Top
Bottom
Posi Grip
1 1/2" MPT
Same as:
Unicel - 4CH-35
 Filbur - FC0161
Spa Filter
Spa Filter
Item# PTL35 4A
Top Load Filter    1 1/2" MPT Adptr
NOTE:  Handle Style Will Vary

Square Feet
Outer Diameter
Length
35
6"
9"
Shopping Options
Top
Bottom
1 15/16" Inner Dia
1 15/16" Inner Dia
Same as:
Unicel - C-6433
 Filbur - FC3920
Spa Filter
Spa Filter
Item# PWK35

Square Feet
Outer Diameter
Length
35
4 15/16"
9 1/4"
Shopping Options
Top
Bottom
2 1/8" Inner Dia
2 1/8" Inner Dia
Same as:
Unicel - C-4335
Filbur - FC2385
Spa Filter
Spa Filter
Item# PRB35-IN

Square Feet
Outer Diameter
Length
65
8 1/2"
10 1/2"
Shopping Options
Top
Bottom
3" Inner Dia
3" Inner Dia
Same as:
Unicel - C-8465
Filbur - FC3965
Spa Filter
Spa Filter
Item# PWK65

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