Non-return valve
thingiverse
This device is a one-way valve that blocks reverse flow. Its functional component is a rubber piece that closes a small opening based on airflow direction. Many mounting options are available. Beyond M5 and 4 mm (with or without locking ring) sockets, a bike pump socket can be installed. This tool is perfect for inflating PET bottles with a bike pump. Oct 30, 2018: Version 2 of bike pump socket added, featuring a slightly longer design and grooves around the nozzle to prevent coming loose. Additionally, version 2 of valve body introduced, with thinner cross lines to enhance seal reliability.
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