O-ring seals - in perfect shape, part 1

TMP1105 O-Rings CS1mm Silicone O Ring OD 1x13/14/15/16/17/18/19/20mm O-Ring VMQ Gasket Seal Thickness 100PCS O Ring White Red Rubber Gasket (Size : OD19x1mm White) : Industrial & Scientific

50pcs O Ring Seal 3.5mm Thickness Red Silicon O Ringen Gasket OD 12mm-40mm O Type Ring Seals Gasket Grommet,29x22x3.5mm : : DIY & Tools

Solved I am having trouble with how to create this feature

3.1mm Thickness Silicon Rubber O-ring Sealing 10-54mm Outer Diameter Red O Ring Seals Gaskets,10mm x 3.1mm 30Pcs : : DIY & Tools

11228 11412 L-Shape O-Ring Gasket Replacement for Intex Sand Filter Pumps Motor Seals Repair Set Parts (4 Pcs 11228 + 1 Pcs 11412) : Patio, Lawn & Garden

10pcs FKM Green O Rings Seal 1.9mm Thickness 62/64/65/68/70/72/75/77/80/85mm Outer Diameter,70x66.2x1.9mm : : DIY & Tools

O-rings designing

O-rings designing

Thinsont 24Pcs Jar Seal O-ring Can Lid Sealing Tool Flexible Silicone O Shape Seal with Groove 4 & 24pc

Pool L-Shape O-Ring O-Ring Gasket Replacement Pool Parts O Rings L Shape O-Ring Gasket Replacement For Pool Filter Pump Sand

Seal Thinking - Seal Design Guide

50Pcs VMQ O Ring Seal Gasket Round Shape Nontoxi Red Thickness CS 1mm OD 5~50mm Silicone Rubber Insulated Waterproof Washer (Color : 50pcs, Size : OD 5MM ID 3MM_CS 1.0MM) :