The Domus GTA-140 is a post top adaptor the collar that lets a Domuspost-top lantern sit on a 43mm column. Five powder-coated colours.

What this part is for, and why it matters

• A post-top lantern has to fit the column it sits on, and post-top spigots are notstandardised a lantern made for one column diameter will not go onto another.
• This adaptor is what bridges that gap. Three sizes are made:43mm (this one), 50mm and 60mm.
• Nothing in the Domus catalogue connects the adaptors to the post tops they serve.The post-top listings record no spigot size, and these adaptor listings name no lantern. So theone part that makes a retrofit possible is effectively invisible from either side.
• Tell us the outside diameter of your column and which lantern you want, and we willput the two together this is exactly the sort of question worth asking before you order rather thanafter a ten-day lead time.

It records two numbers, and labels neither

• Nothing on the listing says which is which, and the two are nearly four timesapart.
• And we now think the 165mm may not belong to this product at all. A secondlisting titled GTA-131 Chester Series Diffuser Only carriesthis adaptor’s web address and the same 165mm diameter. 165mm is a plausible size for a Chester diffuser ring and an implausible one for a columnspigot, so the figure may have travelled from that record to this one.
• We are not going to assert either reading. What is certain is the43mm column size in the title, which matches the GTA-141 at 50mm and the GTA-142 at60mm a coherent set of three. Order on that.
• Ask us and we will confirm both figures with Domus before you order.

The obvious web address serves a different product

• A second listing carries the plaindomus-gta-140-43mm-post-top-adaptor address, and it is a Chester diffuser this adaptor sits at the same address with a -1 on the end.
• So a search result or an old link can land you on the wrong product, and the two arenot remotely interchangeable.
• You are on the right page: this listing is the adaptor. If you arrivedsomewhere titled a Chester diffuser while looking for an adaptor, that is why.
• We measured the whole catalogue: exactly 2 listings of 843 have a titleproduct code that disagrees with their web address, and that Chester listing is one of them.

Which adaptor you need

• Measure the OUTSIDE diameter of your column, not the inside, and not the nominalpipe size a 40mm pipe is rarely 40mm on the outside.
• If your column is not 43, 50 or 60mm, none of these will fit, and no otheradaptor is offered. Tell us the measurement before ordering.

Order it in the same colour as the lantern

• Five powder-coated finishes Beige, Black, Burgundy, Green, White thesame palette as the lanterns.
• Which exists precisely because the adaptor is visible. Order it with thelantern and in the same colour; a separate order is a separate powder-coat batch, and on a165mm collar directly beneath the lantern a mismatch would show.

Where it works

• Fitting a Domus post-top lantern to a 43mm column.
• Retrofitting an existing or heritage post where the lantern has failed.
• A specified column, where an architect wants their own proportions.
• Not without measuring the column’s outside diameter first.

Specifying it

Post top adaptor for a 43mm column. Recorded diameter 165mm. Beige, Black, Burgundy,Green or White. Warranty 1 year. Two figures are recorded and neither is labelled. The title’s 43mm is the column size andfits a coherent set with the 50mm and 60mm adaptors. The 165mm is doubtful aChester diffuser listing carries this product’s web address AND the same figure, so it may belong to thatrecord. That listing also occupies the plain adaptor URL; this one carries a “-1” suffix. Three sizes exist:43mm, 50mm and 60mm. No listing connects these adaptors to the post-top lanterns theyserve tell us your column diameter and the lantern you want and we will match them.

Supplied and supported by Lights For You.

Questions

What does this adaptor actually do?

It lets a Domus post-top lantern sit on a column it was not made for. Post-top spigots are not standardised, so a lantern built for one column diameter will not go onto another and this collar bridges that gap. Three sizes are made: 43mm (this one), 50mm and 60mm. It is the part that makes retrofitting an existing or heritage post possible, which is worth knowing because nothing in the Domus catalogue connects the adaptors to the lanterns they serve.

Why does it list both 43mm and 165mm?

Because it records two measurements and labels neither, which is unhelpful on a part whose whole job is fitting. The 43mm is the column it fits a standard post size, and it sits in a coherent set with the GTA-141 at 50mm and the GTA-142 at 60mm, so that figure we trust. The 165mm is doubtful: a second listing titled “GTA-131 Chester Series Diffuser Only” carries this adaptor’s web address AND the same 165mm diameter. 165mm is plausible for a Chester diffuser ring and implausible for a column spigot, so the figure may have travelled from that record to this one. Order on the 43mm, and ask us if you need the adaptor’s own dimensions.

How do I measure my column?

Take the OUTSIDE diameter, not the inside, and do not rely on the nominal pipe size a “40mm” pipe is rarely 40mm on the outside, which is exactly the trap this part exists to solve. If the measurement comes out at 43, 50 or 60mm there is an adaptor for it. If it is anything else, none of these will fit and no other adaptor is offered, so tell us the figure before ordering rather than after a ten-day lead time.

Will the adaptor be visible?

Probably, and that is worth planning for an adaptor sits at the junction between column and lantern, which is at or above eye level. We would not plan around the recorded 165mm, though: that figure is doubtful, because a Chester diffuser listing carries this adaptor’s web address and the same number. What is certain is that five powder-coated colours are offered, which tells you it is meant to be seen and matched rather than hidden. Order it in the lantern’s colour and order both together so they come from one finish batch and ask us for the adaptor’s actual dimensions if the look matters.

Which lanterns does it fit?

Not stated on this listing, which is the gap that matters most: the adaptor names no lantern and the post-top lanterns record no spigot size, so the one part that makes a retrofit possible is invisible from both sides. Tell us which lantern you want and the diameter of your column and we will put the two together and confirm with Domus before you commit.

Can I use it on a non-Domus post?

That is largely what it is for. If your existing column measures 43mm on the outside, this adaptor is the route to putting a Domus lantern on it a heritage post, a rendered pier with a steel core, or a run where one lantern has failed and the posts are sound. Send us a photograph of the existing fixing along with the diameter and we will tell you whether it will work.

Should I order it with the lantern?

Yes, for two reasons. The powder coat is applied to order, so a separate order is a separate batch and a mismatch on a visible collar directly beneath the lantern would show. And it lets us check the pairing before either part is made, rather than discovering a fit problem when both have already taken ten business days.