Product Name: Adapter Cone, .38 (3/8″ High-Pressure Cone Adapter) – Part No. 10078509

Description:
This component is a high-pressure cone adapter, also known as a coned insert or double cone HP insert, specifically designed for 3/8 inch ultra-high pressure (UHP) waterjet tubing systems . It is a precision‑machined metal sealing component, typically manufactured from high-strength stainless steel or hardened alloy, engineered to create a reliable metal-to-metal seal within a high-pressure fitting assembly .

The cone adapter functions as the intermediate sealing element between two sections of high‑pressure tubing or between a tube and a component port. When the assembly’s gland nut is tightened, the cone is compressed, deforming slightly to fill the space between the outer tube and the inner wall of the fitting . This action creates a leak‑proof, blowout‑proof connection capable of withstanding extreme pressure spikes, vibration, and mechanical shock. The “.38” designation indicates compatibility with 3/8 inch OD tubing, a standard size for medium‑to‑high flow waterjet plumbing .

Applications:

• Critical sealing component in 3/8″ high-pressure fittings for waterjet intensifier pumps and cutting heads 

• Used in unions, elbows, tees, and straight couplings to connect high-pressure tubing 

• Joins high-pressure lines to components such as on/off valves, check valves, and manifold blocks

• Compatible with 60K–94K waterjet systems and fittings from major brands (KMT, Flow, BFT, WSI, OMAX) 

Features:

• 60‑Degree Cone Geometry: Precision‑machined 60‑degree cone seat creates a reliable metal-to-metal seal against mating adapters, valves, or fittings 

• High-Strength Stainless Steel Construction: Provides excellent corrosion resistance and structural integrity under extreme pressure cycling

• Metal-to-Metal Seal: Offers a blowout‑proof, vibration‑resistant seal without the need for elastomeric O‑rings 

• .38 (3/8″) Size: Standard size for medium‑flow high-pressure waterjet plumbing

• Direct OEM Replacement: Interchangeable with OEM part numbers listed in Table 12‑54 (High Pressure Fitting and Valve Assemblies) 

Maintenance:

Inspection:

• Critical Surface Check: Before each use, carefully inspect the cone‘s 60‑degree sealing surfaces for any signs of nicks, galling, deep scratches, or deformation. A damaged cone will create a high‑pressure leak path and must be replaced .

• Thread Condition: Inspect the threads of the associated gland nut and fitting body for damage, as cross‑threading or galling will prevent the cone from seating correctly.

Installation Best Practices:

• Full Depressurization (Critical): Before any maintenance, place the main electrical disconnect in the OFF position, bleed down all high-pressure lines, and follow lockout/tagout procedures. Never service a pressurized HP line .

• Surface Preparation: Ensure the cone adapter and the mating cone seats inside the nut and fitting body are perfectly clean and free of debris, grit, or old sealant .

• Lubrication: Apply a thin, even layer of high‑pressure anti‑seize compound (e.g., “Silver Grade” or “Blue Goop”) to the male threads of the gland nut only. Do not apply any lubricant to the cone insert or its mating sealing surfaces, as this can prevent the necessary metal‑to‑metal friction seal .

• Proper Seating: Slide the cone onto the high‑pressure tube with the correct orientation. Ensure the tube is fully bottomed out in the fitting or component port.

• Torque Compliance: Tighten the gland nut to the specific torque value listed in the equipment service manual. For 3/8″ HP connections, the typical torque spec is 60 ft-lbs (68 Nm) . Use a second wrench to counter‑hold the fitting body to prevent twisting stress on the assembly. Over‑tightening can crack the insert or fitting, while under‑tightening will cause a high‑pressure leak.

• Replacement: Due to its precision nature, if the cone adapter shows any sign of damage or wear, it must be replaced. Do not attempt to repair or “re‑face” a worn insert. When a high‑pressure joint has been disturbed, it is standard practice to replace the cone, gland, and collar as a set .

Cross-Reference Information:

• OEM Part Number: 10078509

• Table 12‑54: High Pressure Fitting and Valve Assemblies (listed as Adapter Cone, .38) 

• Alternative Part Numbers: WO040023, 1‑12401 

• Also known as: 3/8″ HP Cone Adapter, Double Cone HP Insert, Coned Insert