38mm to 51mm inlet? simple change the inlet size and use some tin snips to make the hole bigger in order to attach it.
No good doing that as the SL2 is around the 38mm size anyway.
Prices....... To make JUST a 24ft diy Gutter Vac (similar height to basic Omnipole) you need
Vac £458
5 SL2 base sections = £295
16M of hose, length of threaded rod and 2 clamps = £100
Total = £853 + vat
Omnipole 24ft = £1090 + vat
So a saving of £237 + vat = £278.47 saved
If you are buying an SL2, PLUS you want a gutter vac then the price comes down depending on the SL2 you buy. If you buy a 60ft SL2 then you will already have 3 base sections so the price for makeing a 24ft DIY system is then only £676 + vat so a saving of £414+ vat = £486.45 inc compared to buying a 60ft SL2 AND an Omnivac system.
60ft SL2 + 24ft DIY gutter vac = £1326 + vat = £1558.05
60ft SL2 + 24ft Omnivac system = £1740 + vat = £2044.50
Lovewindows didn't say what height he wants to gutter vac up to so can't give more precise prices on the DIY system. He wanted to know the best price for getting an SL2 AND a gutter vac system.
If you don't need an SL2, or you don't need to use a guttervac at height above 35ft on your own and you can afford the extra cost then go for the Omnivac system. Its a good strong system with plenty of backup and attachments off the shelf.
As stated earlier, comparing the 2 is like comparing a ready made WFP system with a DIY system. both have good points and both have not so good points.....
You make your choice and pay your money.
Regards
Mr H