Comparing The Rubber Grommet # 166-18K And PVC Grommet # 146-18

Updated 01/05/2026 | Published 09/07/2024

Products Featured in This Question

Rubber Grommet and Pigtail for Peterson 2" Round Trailer Lights - Flush Mount

(21)

$4.14

PVC Grommet for Peterson 2" Round Clearance and Side Marker Lights - Flush Mount - Black

(15)

$5.71

Question:

Is the rubber grommet included in this kit the exact same as part number 146-18? 146-18 states its a PVC material and is more expensive. This one just states it as rubber and includes the pigtail for a cheaper price.

asked by: Nate

Expert Reply:

Hi Nate,

I got my hands on both gaskets and there are some very slight differences between the # 146-18 and # 166-18K, but overall they're pretty much the exact same thing. Even though the # 146-18 is made of PVC it's still the same consistency as rubber. PVC is typically stiffer and thus is less durable than rubber but this wouldn't be used in a manner that that characteristic would really matter so there really is no notable difference other than price so I'd go with the # 166-18K to save some money and get a wire harness you can hang onto incase your current one goes bad.

expert reply by: Kevin C

Jameson C.

1/5/2026

Hey Nate, how did things turn out with the rubber grommet and pigtail kit you chose? Did the fit and feel match what you expected compared to the PVC version? Your update could make it easier for others deciding between the two.