the first and second strainer chambers remain open to flow application_number US 55955683 A description reference is made to fig1 through 5 of the drawings which depict a duplex strainer generally indicated at 10 constructed in accordance with a preferred embodiment of the present invention duplex strainer 10 includes a housing 11 having an inlet port 12 and outlet port 14 housing 11 is preferably made from a cast iron material housing 11 includes a first side 11a having a first inlet opening 16 and a second outlet opening 18 a second side 11b of housing 11 includes a third inlet opening 20 and a fourth outlet opening 22 housing 11 also includes an internal wall configuration as depicted in order to properly direct the flow of material such as liquid gas or steam entering inlet port 12 through the housing and out of outlet port 14 as will be described in detail below a first strainer chamber 30 is appropriately secured to first side 11a of housing 11 by for example studs 32 and nuts 34 first strainer chamber 30 includes a first port 36 in fluid communication with first opening 16 of housing 11 and a second port 38 in fluid communication with second opening 18 of housing 11 a removable strainer basket or filter 40 is provided in first strainer chamber 30 for straining and cleaning the material which flows therethrough a second strainer chamber 50 is appropriately secured to second side 11b of housing 11 by.