Petromax Pressure Piece, Screw & Yoke HK250/HK350/HK500

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Petromax · Inner liner · Mounting
Pressure piece, screw & yoke HK250/HK350/HK500 This three-piece set secures the mixing tube in the inner liner. Pressure piece, screw, and yoke belong together and are the targeted repair solution when exactly this clamp is missing or damaged.
Decisive for purchase: For HK250, HK350, and HK500 – not for HK150. Mixing tube, mixing chamber, and inner liner are not included.

Fits well – and when rather not

Fits well if … … parts 20, 21, or 22 are missing or damaged.
… the existing mixing tube itself is intact.
… you are servicing an HK250, HK350, or HK500.


Fits rather not if … … you are repairing an HK150.
… the mixing tube is bent or heavily corroded.
… the complete inner liner is damaged or incomplete.


Features with practical effect

Complete clamping Pressure piece, screw, and yoke together form the intended mounting of the mixing tube.


Secure positioning A complete clamp helps keep the set mixing tube position reproducible.


Three steel parts According to existing Shopify content, the set consists of steel and weighs a total of 9 g.


No replacement for consequential damage A new mounting set neither fixes a bent tube nor a warped inner liner.


Limits, disadvantages, and avoiding wrong purchases Check the mixing tube position after every intervention. The correct distance to the nozzle depends on the instructions of the specific lamp model. Do not use universal values or additional force to compensate for damaged parts.
Technical data with practical interpretation

Compatibility HK250 / HK350 / HK500 – HK150 is not approved.


Scope Pressure piece no. 20, screw no. 21, and yoke no. 22.


Material Steel – mechanical mounting in the hot lamp head.


Weight 9 g
overall – small, but functionally important for barrel fixation.


Scope of delivery 1 × pressure piece, 1 × screw, 1 × yoke. Mixing tube, mixing chamber, burner, and inner jacket are not included.
Safe use Only work on a fully cold and depressurized lamp. After assembly, check the secure fit of the mixing tube and the model-specific mixing tube distance according to the Petromax instructions.
FAQ Does the set fit the HK150? No, the current Shopify data set lists HK250, HK350, and HK500. Is the mixing tube included? No, only the three-part mounting is delivered. What if the mixing tube itself is bent? Then the mixing tube must be assessed or replaced separately. Does anything need to be adjusted after assembly? Yes, the mixing tube position or distance must be checked according to the instructions of the specific model.
Black Raptor · honestly classified
The right choice for a missing or damaged mixing tube clamp. For damage to the tube or inner jacket, this small parts set alone is not sufficient.