Perko Sea Strainer Flush Caps

The link works for me. I have the screw in type that I use for winterizing, they work really well.
 
I use the Groco version of that for winterizing. They work great.
 
I just drilled and tapped my existing Bronze srainer caps for 1/2" NPT threads. To winterize i screw in a short length of brass pipe with a hose attached that I can run to a bucket of antifreeze. 1/2" bronze plug inserted the rest of the time.
 

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