Product Name: Adapter, BSPP/JIC, .75 x .75 (Part No. 05079371)

Description:
This component is a hydraulic adapter that converts between two different industry-standard connection types: BSPP (British Standard Pipe Parallel) and JIC (Joint Industry Council) 37° flare. The .75 x .75 designation indicates that both ends feature a .75 inch (3/4″) male connection.

The BSPP end utilizes a parallel straight thread (G 3/4″) and relies on a bonded seal or O-ring (not included) to create a leak-proof seal against a flat-faced port. The JIC end uses a 37° flare cone to create a reliable, vibration-resistant metal-to-metal seal. This adapter is typically manufactured from high-strength carbon steel with a protective zinc or trivalent plating to withstand harsh hydraulic environments.

According to the official parts diagram for the Reservoir Assembly (P/N 72152878), this adapter is listed as Item 7 and is used to adapt between BSPP and JIC thread forms within the hydraulic circuit .

Applications:

• Converts 3/4″ BSPP male connections to 3/4″ JIC 37° flare male connections 

• Used in the Reservoir Assembly (P/N 72152878) of waterjet cutting systems as a hydraulic interface 

• Connects components with different international thread standards (BSPP common in European systems, JIC common in North American systems)

• Suitable for low to medium pressure hydraulic circuits in waterjet power units

Features:

• BSPP Male End: 3/4″ British Standard Pipe Parallel (G 3/4″) straight thread, seals via O-ring or bonded washer against a flat-faced port

• JIC Male End: 3/4″ JIC 37° flare, provides a vibration-resistant metal-to-metal seal

• Straight Male-to-Male Configuration: Direct in-line connection without changing fluid path direction

• Corrosion-Resistant Construction: Steel body with protective zinc or trivalent plating for durability in moist environments 

• Direct OEM Replacement: Listed as Item 7 in Reservoir Assembly 72152878 parts diagram 

Maintenance:

Failure Diagnosis (When to Replace):

• External Fluid Leakage: Visible oil weeping at either connection. A leak at the JIC end indicates a damaged flare surface or loose nut; a leak at the BSPP end indicates a failed or missing seal (O-ring or bonded washer) 

• Thread Damage: Stripped, galled, or corroded threads on either end prevent proper tightening and sealing

• BSPP Seal Degradation: If the sealing O-ring or bonded washer is nicked, cut, flattened, hardened, or cracked, the seal is compromised 

• JIC Flare Damage: Inspect the 37° flare surface for nicks, scratches, or deformation — any damage will cause high-pressure leaks

• Cracked or Deformed Body: Any visible cracking or distortion of the adapter body requires immediate replacement

Inspection and Replacement Guidelines:

• Full Depressurization (Critical): Before any maintenance, fully depressurize the hydraulic system, shut down the waterjet system, and follow lockout/tagout procedures

• BSPP Seal Replacement: The BSPP connection relies on a seal (O-ring or bonded washer) which is a single-use consumable. Always install a new seal whenever the adapter is removed and reinstalled. Do not use PTFE tape on BSPP straight threads — the seal is made by the O-ring or bonded washer against the port face, not by the threads 

• JIC Flare Inspection: Carefully inspect the 37° male flare surface for damage; the JIC connection seals on the flare cone — even minor damage will compromise sealing

• Thread Preparation: Clean all threads thoroughly with a soft brush and compatible solvent; remove all debris, old sealant, and corrosion

• Do Not Use Thread Sealant on JIC: For JIC connections, do not use PTFE tape or thread sealant — the seal is made at the 37° flare cone, not the threads

• Torque Compliance: Tighten both connections to the specific torque values listed in the equipment service manual using a calibrated torque wrench 

• Two-Wrench Method: Use two wrenches — one to counter-hold the adapter and one to tighten the nut — to prevent twisting stress on the assembly

• Replacement Criteria: Replace the adapter immediately if threads are damaged, the JIC flare surface is compromised, the BSPP sealing face is damaged, the body shows cracks, or persistent leakage occurs despite proper installation with new seals

• Regular Inspection: Periodically inspect adapters for signs of leakage, damage, or corrosion as part of routine hydraulic system maintenance 

Cross-Reference Information:

• OEM Part Number: 05079371

• Used in: Reservoir Assembly 72152878 (Item 7, Qty 1) 

• Alternate Configurations: Similar to Danfoss GG106-NP12-12 (3/4″ BSPP Male to 3/4″ JIC Male) 

• Thread Standards: BSPP G 3/4″ (ISO 228-1); JIC 37° Flare (SAE J514 / ISO 8434-2)