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KMT 20458839 is the rebuild kit for the Insta 1 on/off valve: seat, stem, seals and O rings. It is used on Flow Insta 1 on/off valves. This aftermarket version is made to the same mounting and connections as the original, so it fits where the old one came off.
The same part is also sold as AccuStream 1-11146, H2O Jet 302001-1 and Flow 001959-1.
Sold as one complete set. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Insta 1 On/Off Valve Repair Kit |
| Replaces | Flow 001959-1 |
| Type | On/off valve rebuild kit |
| Valve | Flow Insta 1 on/off valve |
| Supplied as | One kit |
| Cross References | AccuStream 1-11146, H2O Jet 302001-1, KMT 20458839 |
| Fits | Flow Insta 1 on/off valves |
| Condition | New, aftermarket |
| Stat. HS-Code | 848490 |
Flow machines
Check the part number on your old unit before ordering.
| Flow Part No.(SPM Part No.) | Fits |
|---|---|
| 001959-1(SPM-WJP-2951) | Flow Insta 1 on/off valves |
| Brand | Part No. |
|---|---|
| Flow | 001959-1 |
| AccuStream | 1-11146 |
| H2O Jet | 302001-1 |
| KMT | 20458839 (this page, SPM-WJP-2951) |
All of these numbers are the same part.
Water will not shut off
A worn seat or poppet lets water dribble from the nozzle when the valve should be closed. The kit replaces the parts that seal.
Leak from the valve body
Water from the weep hole means the high pressure seal and back up ring have worn. Rebuild the valve before the leak erodes the body.
Planned maintenance
On/off valve seals wear with every cycle. Rebuilding on a schedule stops unplanned downtime on a busy machine.
Fitting tips
Bleed the high pressure and the air supply first. Clean the body, fit every part in the kit, use the correct lubricant on the seal, and check the stem travel before running.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| eBay (5 aftermarket sellers) | USD 35.00 to 49.00 | 6 Oct 2026 |
| Waterjet Depot | USD 79.00 | 6 Oct 2026 |
| AccuStream | USD 93.00 | 6 Oct 2026 |
| Hennco Waterjet Supply | USD 95.00 | 6 Oct 2026 |
| Spare Part Mart | USD 28.00 | Today |
Our price of USD 28.00 is 20% to 71% less than these sellers.
Found this part cheaper somewhere else? Send us the listing and we will beat it by 5% under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
No. It is an aftermarket part made to fit in place of Flow 001959-1. It is not made by or affiliated with Flow; the Flow part number is used only to show what it replaces.
It fits Flow Insta 1 on/off valves. Machines change parts between serial number ranges, so check the number on your old part or in your parts manual.
It is made to the same mounting and connections as the original part. Fit new gaskets and seals where they are used, and check for leaks and correct operation before putting the machine back to work.
Yes, we ship worldwide. Shipping is calculated at checkout, and every order is covered by our 30 day money back guarantee and price beat guarantee.
Prices depend on your ZIP or postcode.
Live rates for the quantity selected, delivered to your door. Confirmed at checkout.
