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The plunger is made of hardened 17-4 PH stainless steel. A protective coat of titanium nitride adds superior abrasion resistance and chemical compatibility for a longer service life.

Hand tightened lock ring provides easy access to plunger and seal.

The spring is made of Inconel and coated with Teflon for an extended service life.

The plunger is separate from the air piston and can be replaced independently at one third the cost of replacing both.

Special cut-resistant ceramic check valve balls have a longer service life than standard stainless steel balls.