Mastercool 83894 R1234yf Manual Coupler Kit includes 83834 High Side R1234yf Coupler (12 mm-F x 17 mm) and 83934 Low Side R1234yf Coupler (12 mm-F x 14 mm), both with extended disconnect protection sleeve

Mastercool’s R1234yf Manual Coupler Kit starts with a single forged brass body — no welded seam, no joint, no weak point. Every dimension, from the seal gland to the hex, is engineered to spec rather than left to chance, giving technicians a coupler that seals right, fits right, and protects the service port on every connection.

• One-Piece Forged Brass Body: No welded seam like a two-piece machined body — just solid, forged brass holding its shape and seal integrity through years of daily use
• Recovers Trapped Refrigerant: Recovers refrigerant trapped between the coupler and fitting instead of venting it, reducing refrigerant loss and lowering costs – especially with higher-priced R1234yf
• Extended Disconnect Protection Sleeve: Prevents the coupler from being removed before the valve core is fully closed, eliminating accidental refrigerant loss through an open port
• Patented Spring-Loaded Depressor: Manufactured to reach the maximum valve core depth specified by SAE guidelines, ensuring reliable, consistent engagement across standard service ports
• Precision-Machined 18mm Hex: Machined to a true 18mm after forging, so a standard wrench seats perfectly every time — no rounded corners, no slipping
• Nickel-Plated Brass: Protects the body from corrosion and discoloration through years of shop use
• All-Metal Construction: No plastic components, built to hold up to drops, impacts, and daily wear
• Meets SAE J639 & J2888: Full compliance with R1234yf service equipment standards

Specifications:

• Compliance: Meets SAE J639 & J2888
• Body: One-piece forged, nickel-plated brass
• Construction: All-metal, no plastic components
• High Side: 12mm-F x 17mm Service Port Major Diameter
• Low Side: 12mm-F x 14mm Service Port Major Diameter
• Hex: Precision-machined 18mm across flats
• Color Coded: Red (high side) / Blue (low side)