It may be that the thread type doesn’t match – please see the compatibility image.

You need to gently push it on while turning a quarter-turn anti-clockwise which will make it sit flat, and then screw clockwise to tighten – It’s a snug fit and can take a little practice.

Please screw the lock on tightly. We’ve designed it to allow you to do this without it jumping the thread on the bottle.

We’re all about discouraging theft – it’ll make the office kitchen thief’s life a bit harder so they take someone else’s milk.

UdderLok is compatible with supermarket milk bottles in the UK and Anchor Dairy milk cartons in New Zealand – we are hoping to expand our range to other countries soon.

We recommend you keep your milk bottles upright.

UdderLok, Load ‘n’ Lok and its packaging are made in Great Britain.

Yes – UdderLok is Type 2 HDPE and the Load ‘n’ Lok bottle is Type 7. Our packaging is also fully recyclable and contains recycled materials.

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Yes – UdderLoks are dishwasher friendly – we also tested the durability of a Load ‘n’ Lok bottle in the dishwasher every day for a year and it passed the dishwasher test.