Precision brass bullet tool for installing small o-rings onto the piston of a first-stage scuba regulator without damage.

This professional first-stage piston O-ring tool, machined from brass, enables technicians to install small O-rings onto piston regulators without damage, supporting common models such as Scubapro MK2, Cressi AC2, and Mares R2s. It features a tapered design to prevent O-ring tearing, enhancing routine maintenance efficiency.

How It Works:

Place the precision-machined brass tool with its opening over the top of the first-stage piston.
Lubricate the small piston O-ring lightly before installation.
Slide the O-ring down the smooth taper of the brass bullet tool.
Push the seal until it slides effortlessly off the tool and snaps cleanly into the designated piston groove.

Key Features & Specifications:

Precision-machined entirely from high-quality, corrosion-resistant brass for long-term reliability.
Tapered bullet architecture protects small, delicate O-rings from stretching or tearing during installation.
Universal design compatible with common first-stage piston models such as Scubapro MK2, Cressi AC2, Mares R2s, Aqua Calypso, and Sherwood Brut.
Smooth exterior finish ensures zero friction, accelerating routine regulator servicing.

Technical Details: