wwaterjet 
SP4-125 End Cap Insert
The End Cap Insert SP4-125 is a critical insert component located in the end cap section of Techni waterjet pumps. It functions as a precision mating part between the end cap and adjacent internal pump components (such as valves, seals, or liners), helping to ensure proper sealing and alignment. This insert must withstand high pressure, mechanical stress, and repeated thermal cycling. Made from hardened, wear-resistant material, it contributes to retaining the integrity of the pump’s pressure boundary — preventing leaks, maintaining stable pressure, and reducing wear on adjoining parts. Correct installation (torque, orientation, surface finish) and periodic inspection are essential to ensure long service life and reliable machine performance.
ITEM NO. | Description | Part Number | Quantity |
1 | Clamp ring | SP4-50 | 1 |
2 | M12x1.25x40 SHCS BLK | 110-1-1240 | 12 |
3 | Plunger | SP-46-3 | 1 |
4 | Internal Circlip | 501-1-0010 | 1 |
5 | O-ring | 500-5-0049 | 2 |
6 | O-ring | 500-5-0089 | 1 |
7 | Seal Housing | SP4-45-175 | 1 |
8 | Wiper Seal | SP1042 | 2 |
9 | Guide Bush | SP4-46-175 | 1 |
10 | M6 x 10 SHCS Black | 108-1-0610 | 1 |
11 | HP Seal Kit | SP1060 | 1 |
12 | Cylinder Liner | SP4-69-175 | 1 |
13 | Cylinder Body | SP-49-13 | 1 |
14 | Check Valve Housing | SP-72-7 | 1 |
15 | LP Check Valve Spring | 500-12-0040 | 1 |
16 | Check Valve Poppet | SP-73-2 | 1 |
17 | Sealing Head | SP-71-9 | 1 |
18 | O-Ring- BS033 | 500-5-0042 | 2 |
19 | Cylinder Retaining Sleeve | SP2-70-5 | 1 |
20 | Valve Seat | 500-20-0111 | 1 |
21 | Outlet Poppet | 500-20-0113 | 1 |
22 | Spring | 500-20-0112 | 1 |
23 | Check valve outer body | 500-20-0100 | 1 |
24 | O-ring | 500-5-0111 | 1 |
25 | End Cap Insert | SP4-125 | 1 |
26 | Clamp | SP4-126 | 3 |
27 | M6 x 12 SHCS Black | 108-1-0612 | 3 |
NA | Collar | 10078715 | 1 |
NA | Gland nut 3/8" | 10078129 | 1 |
High Pressure Outlet Poppet Repair Kit | 500-20-0110 | ||
20 | Valve Seat | 500-20-0111 | 1 |
21 | Outlet poppet | 500-20-0113 | 1 |
22 | Spring | 500-20-0112 | 1 |
Guide Bush Assembly Kit G4 | SP1120 | ||
5 | O-ring | 500-5-0049 | 2 |
6 | O-ring | 500-5-0089 | 1 |
7 | Seal Housing | SP4-45-175 | 1 |
8 | Wiper Seal | SP1042 | 2 |
9 | Guide Bush | SP4-46-175 | 1 |
