A set of transparent heat shrink tubing YT-81460 with a tin ring in the middle and two rings of thermal glue on the sides, which additionally seals the connection.

for conductors with cross-section: 0.25-6 mm2, 24-10 AWG
tube length: 27 – 40 mm
inner diameter tubes: 1.7 – 6 mm
melting point of the solder: 105 C
sheath shrinking temperature: 80 C
set of 220 pieces
organizer-type packaging
Parameters
Diameter [mm]: 1.7-6
Dimensions [mm]: 26-40