a conduit has a first end and interior and exterior surfaces extending downstream from the first end . a strainer has a first end and a second end . an upstream portion of the strainer is positioned engaging a projection on the interior surface of the conduit to resist downstream shifting of the strainer . a strainer body extends at least partially downstream of the upstream portion . the apparatus may be used as a strainer / coupler and may be used to filter water in a chiller apparatus .