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The Standard Suction Strainer has a pot molded 70 durometer PVC Body and 304 Stainless Screen.
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Nylon Suction Strainers have an Injection Molded Black Nylon Body with 304 Stainless Screen and a true threaded 1/2", 3/4" or 1.0" Female NPT connection.
PVC Suction Strainers have Friction Fit Ribs, NOT a true Female NPT ...