Makita Piston A Complete (142071-2) — replacement push piston for Makita caulking/adhesive guns. This original Makita piston restores the drive/plunger that pushes sealant from the tube, bringing back smooth, consistent bead control and reliable thrust during dispensing.
Fits popular Makita cartridge gun models including DCG180 / DCG180ZB / DCG180ZBK, DCG140 / DCG140RF, CG100D / CG100DWAEA and BCG140 / BCG180 (confirm your model number against the list).
Specifics: black plastic piston (approx. 40mm OD, 23mm depth) with the keyed slot and screw hole as used in the original assembly; nut is included while the fastening screw is not. This is a small, low-cost part that’s commonly replaced to return older guns to service and is one of the essential power tool parts for caulking guns.
Straightforward to install — designed to drop into the piston/holder assembly shown on Makita parts diagrams — replace a worn or cracked piston to stop skipping, slipping or uneven extrusion.
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