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Taskstar via Amazon [amazon.com] has for Prime Members: TaskStar 12000 PSI Grease Gun Coupler w/ Quick-Release Design & 6-Jaw Locking Tip for $11.99 – 50% off when you enter promo code 9APC2MA5 at checkout = $5.99. Shipping is free w/ Prime or on $35+.

Note: If promo code doesn’t apply, refresh, re-enter, or review after selecting payment method to see if it already applied.