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My favourite fountain pen is the Muji aluminium pen. Sadly it does not come with a reservoir, only single use plastic refills which I hate for the usual plastic reasons. I have bought five different reservoirs that claim to match the ‘universal’ ink cartridge which don’t. They leak, they are too small, they are re too long for the barrel. I am so happy that this one fits perfectly and I can use my favourite pen again. If you have this pen, THIS is the refill you need. Perfect fit, very smooth action and very well made. Much cheaper than the Bog name brands (which make false claims). Great service from the seller too. Can’t really ask for more
Adapter itself is fine but, like other reviewers, I found that it would not fit in my fountain pen. The product description is wrong - the adapter is actually 7.5cm long (not 6cm). If you need a short standard cartridge adapter then I would suggest that you take a look at the Monteverde Mini Ink Converter SKU 31072 from Pen Heaven - £2.50 inc postage (as of 3/3/18) and works very well. Returned the Pelikan unit to Signs Direct - getting a full refund was a bit of a struggle (they tried to treat it as a customer return, rather than a wrongly described product) but invoking the Amazon A-Z Guarantee helped to focus their minds!
I bought this because it was supposed to measure 6.5cm in length which would have been perfect for my pen. The item which arrived measures 7.5 cm in length which will not fit in my pen. If you give a measurement make sure it is the correct one!