Can you safely tap a 2" PVC pipe?


Well-known member
Jul 23, 2009
Burlington, Ontario, Canada
I have a Hayward off line chlorinator I am no longer using, and would like to remove the two lines that feed it coming off the 2" PVC pipe. My first question is, is there enough "meat" in the PVC pipe to tap and have enough threads to hold a plug? Other question is , if it was a 3/8" hole that was drilled in the pipe, is that the right size hole for a 1/4" NPT tap?

Bama Rambler

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2009
SouthWest Alabama
Yes & Yes.

I have drillled and tapped PVC pipe as small as 1/2". As long as it's schedule 40 you'll be fine. I've even drilled and tapped DWV but it wasn't under perssure.


TFP Expert
LifeTime Supporter
Mar 29, 2007
Coastalish 'down easter'
Why don't you use a tried and effective method of simply taking the input (or output) hoses off and connecting 1 of them to each port? - thereby taking the cl 200 off line?


LifeTime Supporter
Feb 26, 2010
Guam, USA
Ya know, I've been thinking about doing the same thing with my off-line chlorinator, but I'm leaning to drill and tap the hole to thread in a boss for a pressure gauge. No real reason to have one there, but gauges look cool :)

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