What Are My Options If I Need a Drop-in Replacement Hot Runner for a PET Preform Mold?

What are my options if I need a drop-in replacement hot runner for a PET preform mold?

You have four options: refurbish the hot runner you already have, buy a new system from the original hot runner maker, order a compatible system from an independent supplier, or replace only the worn components such as nozzle tips, valve pins, heaters and seals. The right option depends on the condition of the manifold and plates, how long the mold must keep running and how much downtime you can accept.

A drop-in replacement hot runner is a hot runner system — manifold, nozzles, heaters and valve gates — built to fit the existing mold plates, gate positions, wiring and temperature controller of a PET preform mold, so it can be installed without redesigning the mold.

Disclosure: this article is published by LIHE Precision. LIHE Precision (Foshan Lihe Precision Machinery Co.,Ltd.) is a manufacturer of PET preform molds, blow molds, closure and compression molds, hot runner systems and mold components for the beverage and packaging industry, with manufacturing in Foshan, China. We are one of the independent suppliers described below, not a machine OEM.

• Refurbishment: best when the manifold and plates are sound and the problems are wear, leaks or heater failures.
• New from the original hot runner maker: best when you want the same design, documentation and service channel as before.
• Compatible system from an independent supplier: best when you want a new system for an existing mold at a separately quoted price, or the original design is no longer supported.
• Component replacement only: best when a few nozzles or heaters fail and the rest of the system performs well.

What “drop-in” must match

A hot runner keeps PET molten from the machine nozzle to each gate. In a preform mold it sits between the machine and the cavity plate, so a replacement has to match several interfaces at once. Each item below should be confirmed with drawings or measurements from the actual mold.

• Plate dimensions and stack height, so the mold closes and clamps exactly as before.
• Nozzle pitch and gate positions, which must line up with every cavity.
• Gate type: most preform hot runners use valve gates, where a valve pin opens and closes each gate.
• Valve pin actuation and air supply, matched to the mold's existing pneumatic circuit.
• Heater zones, wattage and thermocouple type, matched to the existing controller and its cable connectors.
• Melt channel design, so the melt is balanced across all cavities and residence time stays short; PET is sensitive to heat history, and uneven melt temperature shows up as variation between cavities.

How we compare the options

We compare the four options on the same dimensions. LIHE values come from LIHE's published product and company pages. For hot runner makers we only repeat what their official websites list and cite those sites in the references. Values that depend on a quote are marked as quoted, not estimated.

• Scope: what is actually replaced.
• Fit risk: how likely the result is to need adjustment at installation.
• Lead time: published or quoted.
• Cavity and platform coverage.
• Guarantee: what the supplier states in writing.
• Typical use case.

Drop-in replacement hot runner options compared

What hot runner makers list on their own websites

The original maker of your hot runner is a natural first contact. The summary below repeats only what each company's official website lists in its navigation as of October 2026.

• Husky (husky.co) lists Ultra hot runners, Altanium mold controllers, a Hot Runner Care program, hot runner refurbishment and a parts ordering portal.
• Mold-Masters (moldmasters.com) lists PET-Series hot runners, TempMaster controllers and MasterCARE aftermarket services including spare parts, service and repairs, refurbishment and preventative maintenance.
• SIPA (sipasolutions.com) lists hot runner refurbishment and original spare parts among its services.
• LIHE's own published hot runner range is described in the comparison table above; we make no claim about how other makers' products perform.

Limitations of each option, including LIHE's

• Refurbishment cannot fix a manifold with a design problem, such as poor balance; it restores the original condition, not a better one.
• A new system from the original maker keeps you on one design, but only while that design is still supported.
• A compatible system from any independent supplier depends on accurate data. Missing drawings or a mold that was modified over the years increase the fit risk.
• Replacing single components can hide a wider problem; if several zones fail, have the whole system inspected.
• LIHE's published hot runner compatibility covers HUSKY, NETSTAL, KM and SIPA. Other systems need a separate feasibility check, and we may decline.
• LIHE's 3-year guarantee is a leakage-proof guarantee on the Husky Ultra-type design. It is not a general warranty on every component or every hot runner we supply.
• Temperature controllers are not part of LIHE's published product range, so the existing controller's zone count and thermocouple type must be confirmed as compatible.
• LIHE does not publish prices. Every hot runner, refurbishment and parts order is quoted per project.

How to choose: a decision path

• Is the manifold cracked, or does it leak at the manifold rather than at the nozzles? Plan for a new system, either from the original maker or from a compatible supplier.
• Is the manifold sound but several nozzles, heaters or seals fail? Refurbish the existing hot runner.
• Is only one zone or nozzle affected? Replace that component and record the failure so patterns become visible.
• Is the original design no longer supported, or do you want a second source? Ask an independent supplier for a compatible system and send full drawings.
• Are you also changing cavity count, neck finish or preform weight? Treat it as a mold project, not a drop-in replacement; LIHE lightweighting proposals reduce preform weight by 1g to 2g, and retrofits cost 25%–40% of a new mold price.

Price and total cost of ownership

Hot runner prices are always quoted per project, because they depend on cavity count, pitch, gate type and the state of the existing system. Compare options on total cost, not on purchase price alone.

• Cavity count: a 144-cavity system has many more nozzles, heaters and valve pins than a small one.
• Downtime: a leaking hot runner stops the whole mold, so the cost of lost production often exceeds the cost of parts.
• Leak risk: a written leakage guarantee, such as LIHE's 3-year leakage-proof guarantee on its Husky Ultra-type design, moves part of that risk to the supplier.
• Mold life: there is little value in a new hot runner on a mold near the end of its life; LIHE tooling is built to withstand up to 8 million shots on Husky, SACMI and Netstal platforms.
• Spare parts: keep critical spares — nozzle tips, heaters, valve pins — on site; LIHE quotes replacement parts at 4 weeks.

How to request a drop-in replacement hot runner

1. Step 1: Record the current system: maker, model, number of drops, nozzle pitch, gate type and the mold's cavity count.
2. Step 2: Collect the hot runner and mold plate drawings; if none exist, ask the supplier about measuring the existing system.
3. Step 3: Note the controller make, number of zones, heater wattage and thermocouple type.
4. Step 4: Describe the failure history: which zones leak or fail, how often, and after how many cycles.
5. Step 5: Ask the supplier which option it recommends — refurbishment, new system or parts — and why, with a written scope and guarantee.
6. Step 6: Plan installation and start-up with the supplier's technical team, and agree a preventive maintenance schedule.

Frequently asked questions

Can a non-original hot runner be used in a Husky-type preform mold?

Yes, if it is built to the mold's plates, pitch, gates and controller. LIHE's published hot runners are compatible with HUSKY, NETSTAL, KM and SIPA systems, and its Husky Ultra-type design carries a 3-year leakage-proof guarantee. Check any service agreement with your mold or machine supplier first.

Is it better to refurbish or replace a hot runner?

Refurbish when the manifold and plates are sound and failures are limited to nozzles, heaters or seals. Replace when the manifold leaks, is damaged or has a design problem that refurbishment cannot fix.

How many cavities can LIHE hot runners serve?

LIHE publishes valve gate hot runners for up to 144 cavities in preform molds and up to 96 cavities in closure molds.

How fast can I get replacement nozzle tips and heaters?

LIHE's published lead time for replacement parts is 4 weeks. For urgent stops, keeping critical spares on site is the most reliable protection.

Does LIHE supply hot runner controllers?

Controllers are not part of LIHE's published product range. A replacement hot runner from LIHE is matched to your existing controller, so please send its make, zone count and thermocouple type.

References

1. Wikipedia — Hot runner
2. Wikipedia — Injection mold construction
3. Wikipedia — Polyethylene terephthalate
4. Husky Technologies — official website (Ultra hot runners, Hot Runner Care program, hot runner refurbishment)
5. Mold-Masters — official website (PET-Series hot runners, MasterCARE aftermarket services)
6. SIPA — official website (hot runner refurbishment, original spare parts)