28.5mm to 32mm hose connector

[MikeBz]

I need to join a 28.5mm (or 1+1/8”) ID hose to a 32mm (1+1/4”) ID hose on the raw water intake side of an engine. The only product I can find is this: Stepped Hose Adaptor (13mm to 38mm). I asked ASAP and that was their recommendation, so it ought to be good enough. It just seems a bit hard to spend £20 on a bit of plastic and cut off/discard most of it. Trudesign do a range of unequal connectors but nothing in between 25 and 32mm. With a bit of bronze bar or tube of the right diameter I could get one turned up, but sourcing that in a very small quantity doesn’t look easy. Aluminium would be easy but unanodised I suspect it wouldn’t last long. Any suggestions before I just buy that stepped plastic connector?

 

[Refueler]

Go to Caravan shop ...

 

[Roberto]

Sounds like something for a Perkins 4108
This would do, it's a web shop for motorcycle stuff you should be able to source it somewhere in the UK,
Raccord de durites droit Ø32-28 mm Flexeo noir - Pièces équipement

 

[Alex_Blackwood]

I need to join a 28.5mm (or 1+1/8”) ID hose to a 32mm (1+1/4”) ID hose on the raw water intake side of an engine. The only product I can find is this: Stepped Hose Adaptor (13mm to 38mm). I asked ASAP and that was their recommendation, so it ought to be good enough. It just seems a bit hard to spend £20 on a bit of plastic and cut off/discard most of it. Trudesign do a range of unequal connectors but nothing in between 25 and 32mm. With a bit of bronze bar or tube of the right diameter I could get one turned up, but sourcing that in a very small quantity doesn’t look easy. Aluminium would be easy but unanodised I suspect it wouldn’t last long. Any suggestions before I just buy that stepped plastic connector?

Have a look here.
35mm > 32mm Silicone Reducer Hose Coupler Intercooler Tube Blue

 

[penberth3]

Have a look here.
35mm > 32mm Silicone Reducer Hose Coupler Intercooler Tube Blue

Check the first post, I think you're missing something.

The OP wants to join two hoses, that needs a metal or plastics fitting. something rigid. The coupler you've shown is for joining metal pipe to metal pipe or spigot.

 

[MikeBz]

Well… I was only thinking of an internal connector, but a silicone reducer would go directly onto the water pump (28.5mm) and I could then use a quality 32mm internal connector (Trudesign) at the other end. The silicone reducers also come in 45 and 90 deg bends, one of which (prob 90deg) would be a neat solution. Thanks all!

 

[Daydream believer]

2 short pieces of copper pipe set between a reducer
I do not know what copper life is though.
A plumber will have the copper offcuts & a merchant will have the reducer.
then just solder the 3 bits together. Plumber will do it for you.
Alternatively use Osma plastic pipe & compression fitting between.

 

[peteK]

A short piece of 30mm copper pipe would work for joining the pipes.

 

[Daverw]

A female threaded reducer with appropriate hose tails would be ideal

 

[Boater Sam]

A 28mm copper Yorkshire capillary #1 coupler solder fitting with a stub of 28mm pipe in one end. The other end of the coupler will be the right size over the solder ring bumps for your 32mm.

 

[AngusMcDoon]

Go to Pond and Aquarium shop...

Laguna Multi Hose Joiner Adaptor Connect Different 20mm - 38mm Pond Hosing | eBay
or
Amazon.co.uk

 

[Alex_Blackwood]

Check the first post, I think you're missing something.

The OP wants to join two hoses, that needs a metal or plastics fitting. something rigid. The coupler you've shown is for joining metal pipe to metal pipe or spigot.

Just an Idea That may or may not be helpful Where's yours
I do take the point!

 

[Fr J Hackett]

Any reducer will further restrict the flow of water which might be important in relation to the engines cooling.

 

[penberth3]

Any reducer will further restrict the flow of water which might be important in relation to the engines cooling.

Good point. The 28mm copper idea would minimise that, assuming the copper is compatible with the antifreeze.

 

[MikeBz]

Any reducer will further restrict the flow of water which might be important in relation to the engines cooling.

So I’m decided: 1” BSP skin fitting/ball valve, 32mm hosetail, 32mm inlet & outlet on the strainer, raw water pump has ~28.5mm inlet (which is part of the pump casting and cannot be changed). So with a tapered silicon hose on the pump, 28.5mm at the pump end, 32mm at the other end connected to the pipe from the strainer by a straight connector, the smallest diameter is the inlet to the pump itself. Thanks to @Alex_Blackwood for putting me on that route!

 

[Alicatt]

28mm, 32mm, and 2" piping is common in swimming pools and there are plenty of conversion connectors available for them.
I have 28mm Intex valves on the pool but the piping to the solar panels are 32mm and go through a stepped reducer between one and the other.

 

[Alex_Blackwood]

Good point. The 28mm copper idea would minimise that, assuming the copper is compatible with the antifreeze.

The reducers are on the suction side of the pump, not the discharge so shouldn't make a difference. A point easily missed

 

[Alex_Blackwood]

So I’m decided: 1” BSP skin fitting/ball valve, 32mm hosetail, 32mm inlet & outlet on the strainer, raw water pump has ~28.5mm inlet (which is part of the pump casting and cannot be changed). So with a tapered silicon hose on the pump, 28.5mm at the pump end, 32mm at the other end connected to the pipe from the strainer by a straight connector, the smallest diameter is the inlet to the pump itself. Thanks to @Alex_Blackwood for putting me on that route!

Pleased to be of help it works.