Thread: Connnecting 32mm and 38mm vacuum hoses

There are propper expensive joiners at some retailers, but I know you like the cheap approach like me, so would recommend just Gaffa tape. The grey plastic stretch stuff, works a treat . To avoid the abrupt change you can cut a plastic ice-cream container or similar to form a cone between the two first, then cover in Gaffa tape.

How about starting off with a couple of straight connectors, one of each size (if you have spare ones), if not, see if any of the plastic plumbing pipe or fittings will fit - or be made to fit by cutting them axially.

You could cut one or two short sleeves of the same plumbing pipe and then cut them axially too, so they will compress and fill the gap between the 32mm pipe and the 38mm pipe. I would overlap any joins in successive sleeves. Glue them all together and when dry, smear more glue around the internal steps to smooth the transition between the two diameters.

Someone else suggested using a neoprene sleeve. The easiest source of neoprene is to get a stubby holder and cut and sew it to size. I haven't used this method yet but I like the sound of it as it gives some flexibility to the joint. This is useful with an SCMS or power tools like sanders etc. as they move. I am going through the same thing at the moment and have cobbled together irrigation pipe, electrical conduit and plumbing pipe.

Some of my pipe is 2-3 mm too big so I cut a sleeve about 50mm long then cut out 2 or 3 mm down the long side, making it a smaller diameter. PVC cement or gaffer tape seals it of.

I really wish there was some standardisation in small tool dust extraction, vacuum cleaners etc.

Let me know if you need help disposing of any cans of beer stuck in the stubby holders.

I spent some time at Bunnings today in their plumbing department, as you do, and came up with some bits and pieces that would do the job.

Rather than joining the 2 hoses, I found bits that would fit over the 38mm OD outlet on the Makita SCMS. It was then a matter of stepping down to the 32mm hose.

The end result is a fitting that goes on the Makita SCMS and connects to a 32mm hose. The large end of the fitting is 38mm ID, and the small end is 33mm OD, which fits a standard 32mm ID hose very snugly. This hose then goes to my Triton dust bucket.

The invoice is attached showing the part details, and photos showing the assembly, with the 32mm High Pressure pipe pipe cut to length. The HP pipe is at the big end, and the 20mm coupling is at the narrow end, with the stepped slab adapter in the middle.

The only short coming is that the ID of the small end is only 28mm - ie considerable flow reduction, but certainly better than the little dust bag on the SCMS

What a waste of time and money that was!

Went to the local vac shop this morning, and was shown how the standard 32mm hose fits snugly inside the standard 38mm hose, and with a bit of silastic, is an airtight join, almost invisible.

Still, it was a good learning experience

Originally Posted by JillB

What a waste of time and money that was!

Went to the local vac shop this morning, and was shown how the standard 32mm hose fits snugly inside the standard 38mm hose, and with a bit of silastic, is an airtight join, almost invisible.

Still, it was a good learning experience

yep, That system works for me.
Gets a bit clogged up when i rip timber (which you are not supposed to do).

Well done Jill on figuring it out.

Graham