Diameter of the Base on the Lippert Components 360 Siphon RV Holding Tank Vent Cap LC389381

Question:

Looking at part #LC389381 to replace a roof vent on my camper. Im not positive my vent is the black water holding tank vent, but it could be. Trying to determine if this is a replacement part for my existing broken vent. See 2 pics attached. Existing vent has 5 or 6 screw holes and yours only has 4. More importantly, what is the diameter of the base of this replacement part? Thanks.

asked by: Dave M

Expert Reply:

The roof vent on your trailer is most likely for black water tank. The Lippert Components 360 Siphon RV Holding Tank Vent Cap part # LC389381 has a base with a 4" outer diameter. The holes most likely won't line up with your existing roof vent but you can drill new ones, jut make sure to seal everything up with part # 34427034145-1. The Lippert Components 360 Siphon RV Holding Tank Vent Cap is designed for a 1-1/2" or 2" diameter vent stack which is a standard size so as long as this is what you have then you should be good to go.

expert reply by: Conner L

click to enlarge

Dave S.

4/24/2020

I am thinking that if it happens to be a bit higher, it would “gather” more of a passing breeze, and therefore work better. Thanks again for your prompt reply.

Chris R.

4/25/2020

That's a really good point.

David S.

4/22/2020

No, I meant that it looks higher overall which is fine with me than it looks in other pictures of the 360 siphon I have seen. Maybe that is because it is the Gen 2 version. Thanks for your prompt reply,

Chris R.

4/24/2020

I gotcha! I'm not aware of any dimensional changes with the current version but it could be taller by just a bit. Like you alluded to though, this won't affect its function or fit on your RV/trailer.

David S.

4/20/2020

This picture of the 360 vent looks like it has a higher rise to it than it appears in other pictures. Pleas advise. Kind Regards,

Chris R.

4/22/2020

I'm not quite sure what you're asking. Do you mean to say that the Lippert 360 Siphon Vent # LC389381 looks taller than your existing vent? Note that the customer submitted image on the above answer is not the 360 vent, but simply a different model serving the same purpose.