Sight Glass

[BarbPitt54]

I just replaced the sight glass on my Pentair Tagelus filter and switched from one with holes to one without. Now I'm nervous that I shouldn't have done that. Do I NEED those holes? I've got myself wondering if this thing is going to blow up when I try to backwash now.

 

[SecoSteve]

Not sure about the sight glass as I don't have one on my filter.

BUT, your filter is degrading considerably. The fiberglass threads are showing and it could be a matter of time before that top springs a leak, or, even worse, explodes!! Think about replacing your filter sooner rather than later.

 

[JamesW]

Do I NEED those holes?

The holes are a vacuum breaker.

You do not need the holes unless the waste line is hard plumbed and you need the line to drain.

A hard plumbed line should use a vacuum breaker of some sort to avoid water hammer.

You can use an air admittance valve on a T.

1-1/2 in. NPT Black ABS In-Line Air Admittance Vent

Pentair Valve Sight Glass - 272550

Oatey 1-1/2 in. NPT Black ABS In-Line Air Admittance Vent 39012 - The Home Depot

Help prevent sewer gas from entering your home while you vent your drain line with the Oatey 1-1/2 in. ABS In-Line Cheater Vent. This spring-loaded vent uses negative pressure to open and positive pressure

www.homedepot.com

https://www.lowes.com/pd/Keeney-Plastic-Air-Admittance-Valve/1069119