Standard: Length: 5 "/ 10"; inlet /outlet size: 1/4”, 3/8”, 1/2”; Color: Clear / White / Blue

Length: 10 "/ 20"; inlet /outlet size: 3/8”, 1/2”, 3/4”; Color: Clear / White / Blue

BIG FAT: Length: 10 "/ 20"; inlet /outlet size: 1”, 1.5”; Color: Clear / White / Blue

For More References: http://www.aquawin.com.tw/faq/filter-housings.html

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