Water-saving shims for shower head

Energy prices are skyrocketing, winter is coming, and unfortunately I'm heating my water with electricity, so I've designed this shim to reduce my energy bill.

I'm using the 3.5 mm version and was able to reduce my water flow from 12 l/min to 8 l/min.

Dimensions: ⌀18.5 mm x 2 mm

Availible diameter:

• 4.5 mm
• 4 mm
• 3.5 mm
• 3 mm
• 2.5 mm
• 2 mm

Print it in TPU or use a sealing washer, so the shower head is not leaking.