mbrooke
Batteries Included
- Location
- United States
- Occupation
- Technician
What is your preferred choice for filling open KOs?
Knock out filler
- Thread starter mbrooke
- Start date
- Status
- Location
- Tennessee NEC:2017
- Occupation
- Semi-Retired Electrician
I buy the KO plugs in several sizes and use when needed.
mbrooke
Batteries Included
- Location
- United States
- Occupation
- Technician
Which brand though?
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
- Location
- Tennessee NEC:2017
- Occupation
- Semi-Retired Electrician
Plugs-R-Us
synchro
Senior Member
- Location
- Chicago, IL
- Occupation
- EE
Do you guys ever use the 3-piece plugs with a screw/bar attachment like the one below?
They're more expensive but easier to attach in certain limited clearance situations.
https://www.cesco.com/Dottie-Co-L-h...Steel-Knockout-Seal-1-2-Inch-3-Piece/p2105106
They're more expensive but easier to attach in certain limited clearance situations.
https://www.cesco.com/Dottie-Co-L-h...Steel-Knockout-Seal-1-2-Inch-3-Piece/p2105106
ptonsparky
Tom
- Occupation
- EC - retired
No. Something to work loose and fall into the panel.
hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
- Occupation
- EC
No, but I have used the two piece ones with a screw and nut in the center for large KOs. Other than that the snap in ones work fine. I've never had a problem with getting them into tight places. Lay a screwdriver over it and and smack the shaft with your linesmans as close to it as you can get.
-Hal
zbang
Senior Member
- Location
- Roughly 5346 miles from Earls Court
I've used 2"-3" ones to fill a hole that'll be opened up again in a week/month. Wouldn't bother for anything maybe 1" or smaller.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Doesn't everyone know you're supposed to use 4" sq covers for large KOs? 
mbrooke
Batteries Included
- Location
- United States
- Occupation
- Technician
My local Toys-R-Us had a huge close out on Raco.
Doesn't everyone know you're supposed to use 4" sq covers for large KOs?
Or 4-11/16" covers.
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
Yes I'm with you, I like those. Hate those one piece ones, but if you are at home desperate that's all they got
Does not happen. Had problems with the one piece ones falling out though industrial plants. It’s actually a 4 piece. There is the grey outer cover then a piece of foam rubber gasket/seal that makes it NEMA 4 under that. Then a conduit reducing washer piece that goes on the inside and finally a wing nut that squeezes it all together. Works great. Biggest brand name is Hoffman so there’s most of your high price with the name,
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
The one piece ones are also a pain to splay out all the wings after you snap it in. Some people skip that step.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
I don't think you're supposed to need to, but the prongs are not springy enough for a snug fit, so spreading two or three is par.
They're also tough to snap into many KOs, but I've found prying them in with Channellocks to be easier than banging them in.
romex jockey
Senior Member
- Location
- Vermont
- Occupation
- electrician
I've cheated in the past w/these>
~RJ~
~RJ~
ptonsparky
Tom
- Occupation
- EC - retired
I've cheated in the past w/these>
~RJ~
Ah yes, the multipurpose fitting. More than once. Romex connector, snap in drain, and ventilated hole closure.
- Status