Replacing Drain Plug for Homemade Chlorine Injection System

[benjydog]

After reading the excellent thread started by Mark (@mas985) (Homemade Acid OR Chlorine Injection System), I've decided to embark on my own take on this. If its successful, I plan on making a post or updating the original (its been quite since end of last year so may want to consider it done, plus some of the good posters no longer look active)

The thread documents that most pumps use a 1/4 NPT drain plug, but without checking mine, I recall it being larger. I haven't been able to find the sizing online. Does anyone know? I have a Hayward SP3200VSP and it uses part SPX4000FG, but I have not been able to find a site that lists the thread details.

Anyone?

This is to save me from removing the plug, taking it to a plumbing store and having them measure or "try-and-guess". Also saves me from buying extra, non-returnable, parts (cost savings is the goal).

Thanks!

 

[mas985]

I doubt it is different. Just measure the outside threads and compare to the npt specs.

 

[benjydog]

Thanks Mark! Looking to follow in your footsteps on this design, but finding parts in Canada is proving to be an issue. May have no choice but to order from USPlastics and pay the duty....

 

[Richard320]

Check a boat or RV supply. They use a lot of plastic tanks and plastic fittings.

 

[benjydog]

Thanks. Will look for one near by. Was also thinking of a water purification/supply company as well.