Caulking guns, typically have a trigger connected to a rod which pushes the plunger, and has a ratchet to stop the pressure reducing.
The push rod may also be actuated by a motor or by compressed air in some commercial guns.
Send your message to Bubble Wrap 88 Enterprise
Main Office
Bubble Wrap 88 Enterprise 202103382322 (003354020-T)
45, Jalan Sawit Baru 4, Taman Perindustrian Sawit Baru, 81030 Kulai, Johor, Malaysia.