InterpumpPumps & Compressors

Interpump PUMP WK5021 DX FLUSHING

The Interpump WK5021 DX is an industrial flushing pump delivering 21 L/min at 500 bar pressure, powered by a 20.59 kW motor. Operating at 1450 rpm, it suits high-pressure cleaning and industrial fluid systems…

SKU 3G-ITP-01818

Also listed as: WK5021F000 · WK5021F 000

Brand

Interpump

Item

PUMP WK5021 DX FLUSHING

Local availability & support — Singapore

Local office: 20 Woodlands Link #09-05, Singapore 738733
Phone: +65 8878 8355
Delivery: Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment: Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to: Singapore

Technical Specifications

Interpump

Flow Rate

21 L/min

Pressure

500 bar

Power

20.59 kW

Speed

1450 RPM

Weight

21.5 kg

Dimensions

350 mm

Power

28 HP

Flow (US)

5.55 GPM

Pressure

50 MPa

Pressure

7250 PSI

Datasheet Content

WK5021




TECHNICAL INFORMATION
Flow (L/min)                        21
Flow (US Gpm)                       5,55
Rotation regime (rpm)               1450
Pressure (MPa)                      50
Pressure (bar)                      500
Pressure (psi)                      7250
Power (hp)                          28
Power (kW)                          20,59
Overall dimensions L x l x h (mm)   350x243x187,5
Weight (kg)                         21,5




WK5021                                              3/21/2026   Page 1 - 8
Copyright INTERPUMP GROUP S.P.A
WK5021

     Documents

Male shaft (key)

Male shaft (key) - Flushing




WK5021                            3/21/2026   Page 2 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key)




WK5021                            3/21/2026   Page 3 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key)

Pos.     Code           Description                   Qty Notes
KIT3     34000301       KIT 3 OIL SEAL D.30X55X7      1
KIT2     34000201       KIT 2 OIL SEAL D. 22X32X5,5   1

KIT180   34018001       KIT 180 SEALS D. 18           1
KIT176   34017601       KIT176 COMPLETE SEALS D.18    1

KIT150   34015001       KIT 150 INTAKE/DEL.VALVE      1
61       47151022       OPEN SIDE COVER (47-66)       1
60       91489200       KEY 8(h9)X7X35 UNI 6604/A     1


59       66020035       CRANKSHAFT C.19 - D. 24       1
58       90164800       OIL SEAL 30x55x7              1
57       99188400       SCREW M 6x20 UNI 5931         4
56       90391300       O-RING 67,95X2,62 (3268)      2
55       47151222       SIDE CRANKCASE COVER FOR      1
                        OIL GAUGE
54       91838000       ROLLER BEARING NJ2206EC       2
53       90387700       O-RING 39,34X2,62 (3156)      1
52       70211801       OIL SIGHT GLASS               1
51       90075600       CIRCLIP D.45 (ZJ45)           1
50       99303900       SCREW M 8x16 UNI 5931         8
49       66050066       PISTON GUIDE - S.S.           3
48       90162500       OIL SEAL 22x32x5              3
47       90912600       BUSHING 22X25X30              3
46       66010022       CRANKCASE                     1
45       99309900       SCREW M 8x35 UNI 5931         6
44       98210600       OIL DIP-STICK G3/8X80         1
43       90392200       O-RING D.133.02X 2,62(3525)   1


42       66160022       REAR COVER                    1
41       47200074       PUMP FOOT                     2
40       96710600       WASHER 10,2                   1
39       98204250       PLUG G1/4"x12                 1
38       99364400       SCREW M 10x18-5931            1
37       97740500       CONNECTING ROD-PIN D.14X39 3


36       66030001       CONNECTING ROD                3
35       96710100       WASHER D. 10X28X0.5           3
34       90358500       O-RING 10,82X1,78 (2043)      1
33       66080370       PACKING RETAINER D.18         3
32       90361600       O-RING 34,65X1,78 (2137)      3
31       90265200       SEAL D.18X26X6,5 L.P.         3
30       66216370       INTERMEDIATE RING D. 18       3




WK5021                                                            3/21/2026   Page 4 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key)

Pos.   Code             Description                  Qty Notes

29     90265500         PACKING 18.0x28x10.0 HP      3
                        66
28     66040309         PISTON D.18X54               3
27     90358400         O-RING D.10,82X1,78(2043)90SH 3


26     66219566         PISTON BOLT                  3
25     93185800                                      1
24     98209900         PLUG G. 3/8X13 NICKEL        1
23     98217900         PLUG G 1/2X10 NICKEL         1
22     96751400         WASHER 21,5X27X1,5           1
21     99382000                                      8
20     66210166                                      3
19     90511500         ANTI-EXTRUSION RING          3
18     90384300         O-RING 17,86X2,62 (123)      3
17     99368700                                      8
16     66220336                                      1
15     66210070                                      3
14     90516500         ANTI-EXTR.RING D.24.7x29x1.5 3


13     90385700         O-RING 23,81X2,62 (132)      6
12     36712101         INTAKE/DELIVERY VALVE        6
11     36202551         VALVE CAGE                   6
10     94737600         SPRING D. 9,4X14,8           6
9      36203266         SPHERICAL VALVE              6
8      36200366         VALVE SEAT                   6
7      90384100         O-RING 17,12X2,62 (3068)     6
6      90359600                                      3
5      90511800                                      3
4      66210270                                      3
3      98197200         PLUG G1/8X8 S.S.             3
2      90357600                                      3
1      66124936                                      1




WK5021                                                           3/21/2026   Page 5 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key) - Flushing




WK5021                                     3/21/2026   Page 6 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key) - Flushing

Pos.     Code           Description                   Qty Notes
KIT3     34000301       KIT 3 OIL SEAL D.30X55X7      1
KIT2     34000201       KIT 2 OIL SEAL D. 22X32X5,5   1

KIT180   34018001       KIT 180 SEALS D. 18           1
KIT176   34017601       KIT176 COMPLETE SEALS D.18    1

KIT150   34015001       KIT 150 INTAKE/DEL.VALVE      1
61       47151022       OPEN SIDE COVER (47-66)       1
60       91489200       KEY 8(h9)X7X35 UNI 6604/A     1


59       66020035       CRANKSHAFT C.19 - D. 24       1
58       90164800       OIL SEAL 30x55x7              1
57       99188400       SCREW M 6x20 UNI 5931         4
56       90391300       O-RING 67,95X2,62 (3268)      2
55       47151222       SIDE CRANKCASE COVER FOR      1
                        OIL GAUGE
54       91838000       ROLLER BEARING NJ2206EC       2
53       90387700       O-RING 39,34X2,62 (3156)      1
52       70211801       OIL SIGHT GLASS               1
51       90075600       CIRCLIP D.45 (ZJ45)           1
50       99303900       SCREW M 8x16 UNI 5931         8
49       66050066       PISTON GUIDE - S.S.           3
48       90162500       OIL SEAL 22x32x5              3
47       90912600       BUSHING 22X25X30              3
46       66010022       CRANKCASE                     1
45       99309900       SCREW M 8x35 UNI 5931         6
44       98210600       OIL DIP-STICK G3/8X80         1
43       90392200       O-RING D.133.02X 2,62(3525)   1


42       66160022       REAR COVER                    1
41       47200074       PUMP FOOT                     2
40       96710600       WASHER 10,2                   1
39       98204250       PLUG G1/4"x12                 1
38       99364400       SCREW M 10x18-5931            1
37       97740500       CONNECTING ROD-PIN D.14X39 3


36       66030001       CONNECTING ROD                3
35       96710100       WASHER D. 10X28X0.5           3
34       90358500       O-RING 10,82X1,78 (2043)      1
33       66080370       PACKING RETAINER D.18         3
32       90361600       O-RING 34,65X1,78 (2137)      3
31       90265200       SEAL D.18X26X6,5 L.P.         3
30       66220570                                     3




WK5021                                                            3/21/2026   Page 7 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key) - Flushing

Pos.   Code             Description                  Qty Notes

29     90265500         PACKING 18.0x28x10.0 HP      3
                        66
28     66040309         PISTON D.18X54               3
27     90358400         O-RING D.10,82X1,78(2043)90SH 3


26     66219566         PISTON BOLT                  3
25     93185800                                      1
24     98209900         PLUG G. 3/8X13 NICKEL        1
23     98217900         PLUG G 1/2X10 NICKEL         1
22     96751400         WASHER 21,5X27X1,5           1
21     99382000                                      8
20     66210166                                      3
19     90511500         ANTI-EXTRUSION RING          3
18     90384300         O-RING 17,86X2,62 (123)      3
17     99368700                                      8
16     66220336                                      1
15     66210070                                      3
14     90516500         ANTI-EXTR.RING D.24.7x29x1.5 3


13     90385700         O-RING 23,81X2,62 (132)      6
12     36712101         INTAKE/DELIVERY VALVE        6
11     36202551         VALVE CAGE                   6
10     94737600         SPRING D. 9,4X14,8           6
9      36203266         SPHERICAL VALVE              6
8      36200366         VALVE SEAT                   6
7      90384100         O-RING 17,12X2,62 (3068)     6
6      90359600                                      3
5      90511800                                      3
4      66210270                                      3
3      98197200         PLUG G1/8X8 S.S.             3
2      90357600                                      3
1      66125136                                      1




WK5021                                                           3/21/2026   Page 8 - 8
Copyright INTERPUMP GROUP S.P.A

Technical Documents

(1)

Technical Data Sheet

PDF Document

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Interpump Products

3G Electric (S) Pte. Ltd. — Singapore

Product Description

Frequently Asked Questions

What is the Interpump WK5021 DX flushing pump used for?

The Interpump WK5021 DX is an industrial flushing pump designed for high-pressure cleaning and fluid systems. It delivers 21 L/min at 500 bar, making it suitable for demanding applications such as pipe flushing, surface preparation, and industrial water-jet tasks where robust performance is required.

What are the specifications of the Interpump WK5021 DX pump?

The Interpump WK5021 DX pump delivers 21 L/min at 500 bar (50 MPa, 7250 psi) and operates at 1450 rpm. It is powered by a 20.59 kW (28 hp) motor, weighs 21.5 kg, and has overall dimensions of 350x243x187.5 mm. The pump features a male shaft with key and a flushing configuration.

Where to buy the Interpump WK5021 DX pump in Singapore?

You can source the Interpump WK5021 DX flushing pump through 3G Electric in Singapore. We handle logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on this industrial pump.

How to maintain the Interpump WK5021 DX pump?

Regular maintenance of the Interpump WK5021 DX includes checking oil level via the sight glass and dip-stick, inspecting seals and O-rings (such as the KIT3 oil seal D.30x55x7 and KIT2 oil seal D.22x32x5.5), and replacing worn packing and valves. Always follow Interpump’s service manual for proper procedures.

Used in

Common applications for Interpump

Shipyard hull cleaning and surface prep — HT100 and W951 paired with dual-lance guns for dockyard service

Petrochemical heat-exchanger descaling — WS-series stainless pumps for neutral-pH cleaning chemistry

Outdoor HVAC condenser mist cooling — ZP180 pumps on rooftop chiller decks

Textile fibre-finishing — W170 and W270 for mist-jet application across drying lines

Municipal water treatment — W951 motor pumps for high-pressure disinfection chemical injection

Spare Parts & Repair Kits

Official WK5021 parts list — 107 parts, 54 available in catalog

Official Parts List

WK5021 — Male shaft (key) exploded diagram

Repair Kits — Order These for Routine Maintenance

KIT2

KIT 2 OIL SEAL D. 22X32X5,5

34000201×1Available

Interpump PUMP WK5021 DX FLUSHING

Local availability & support — Singapore

Technical Specifications

Datasheet Content

Technical Documents

Need installation or engineering help?

Ask a question

Product Description

Frequently Asked Questions

Used in

Spare Parts & Repair Kits

Recommended Spare Parts

Interpump Products

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