Giant Button Head Coupler for 7/8" Zerks 

• 1/8-27 NPT Female
• Button Head, Heavy Duty, Pull-On 1/8-27 NPT Female
• Aluminum, 7,500 psi, for use with Heavy Duty Button Head Fittings
• Air and Battery Equipment
• Fits Zerks that measure 7/8"  or 22 mm across the face
• Price is for 1 Piece