Button Lid Hull: What It Is and How to Fit It Correctly

By frank green Australia: Reusable Cups and Bottles, Stainless ... | Published: 2026-11-03

Category: How-to Guides

The button lid hull is the replacement shell for your frank green lid, sold without the button. Here's how to identify the part, fit it correctly, and keep the assembly clean.

Quick answer

The button lid hull is the outer shell of a frank green button lid, sold as a replacement part without the button. To fit it, transfer your existing button into the new hull, press the hull evenly onto the lid base until it seats flush, then test the button action before use.

Why the hull is sold without a button

The Button Lid Hull and Accessory Pack is designed to replace the part that wears or breaks while you keep the button you already have. That keeps the replacement cheaper and avoids sending a perfectly good button to landfill. The trade-off is that you must remove and refit the button yourself, so set aside a clean workspace and check that your button is still intact before you start. If the button itself is damaged, this pack alone won't restore the lid.

When a new hull is the right fix, and when it isn't

Replace the hull when the shell is cracked, the button no longer sits securely, or the lid no longer seals evenly against the cup rim. If the lid leaks only when tipped, check that the silicone seal is clean and seated before buying parts. If the button is missing or broken, the hull pack won't help on its own because it does not include a button. Match the colour option to your existing lid so the assembly looks consistent.

How to fit the button lid hull step by step

Remove the old hull: Open the lid and gently prise the old hull away from the lid base, working around the edge rather than yanking one side. Common mistake: forcing a single corner can crack the retaining clips. Keep the old hull aside until the new one is fitted and tested.
Transfer the button: Take the button out of the old hull and seat it into the matching opening in the new hull, checking that it moves freely. Common mistake: fitting the button upside down, which makes it stick. Press the button a few times before continuing; it should spring back on its own.
Seat the hull on the lid base: Align the hull with the lid base and press evenly around the rim until it clicks or sits flush. Common mistake: pressing only the centre, which leaves the outer edge raised. Run a finger around the seam; any gap means the hull isn't fully seated.
Test the assembly: Fill the cup with water, close the lid, and press the button to check the flow. Common mistake: skipping the water test and discovering a poor seal only when you're out. If water seeps at the rim, lift the hull and reseat it before use.
Clean and dry the parts: Wash the hull and button in warm soapy water, rinse, and let all parts air-dry fully before reassembling. Common mistake: reassembling while damp, which traps moisture around the button. Clean the button opening with a soft brush to stop residue building up.

Replacement part at a glance

Button Lid Hull: The Button Lid Hull and Accessory Pack replaces the hull and included accessories but does not include a button. You can refresh a worn lid shell without buying a whole new lid, as long as your existing button is still in good condition.
Button Lid Hull