Petromax Pump Button blue HK150/HK250/HK350/HK500

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Petromax · Pump · Operating Knob
Pump Knob blue HK150/HK250/HK350/HK500 The blue, knurled pump knob sits at the end of the pump rod and is the hand-held operating surface when building pressure. It is a grip part – not a sealing or pressure component.
Purchase decision: fits HK150, HK250, HK350 and HK500. Only the blue knob with Petromax lettering is delivered.

Fits well – and when rather not

Fits well if … … the pump knob is missing, cracked or damaged.
… the pump rod and its connection are intact.
… you want to visually and functionally complete an HK150 to HK500.


Fits rather not if … … the pump does not build pressure.
… pump leather, valve or rod are damaged.
… you are looking for the blue handwheel on the carburetor.


Features with practical effect

Knurled operating surface The edge improves grip when pulling and pushing the pump rod.


Blue with Petromax lettering The design is also suitable for visually completing a classic HK lamp.


Four HK models The Shopify data set lists HK150, HK250, HK350 and HK500.


Operating part only The knob transfers hand force to the rod. Pressure is generated by pump leather, pump chamber and valve working together.


Limits, disadvantages and avoiding bad purchases A new pump knob does not improve poor pressure build-up. For a smooth-running pump without delivery, first check pump leather and pump system. A damaged rod end is also not repaired by the knob.
Technical data with practical interpretation

Compatibility HK150 / HK250 / HK350 / HK500.


Design Blue, knurled, with Petromax lettering.


Function Hand grip of the pump rod – not a sealing part.


Part number 40-b – discreet for spare part allocation.


Scope of delivery 1 × blue Petromax pump knob
. Pump rod, pump leather, pump cover, valve, and complete pump are not included.
Safe use Work only on a cold, depressurized lamp. Before assembly, check the connection on the pump rod and attach the knob straight without force.
FAQ Is this the complete pump? No, only the handle knob is delivered. Does the knob fit the HK150? Yes, also fits HK250, HK350, and HK500 according to Shopify. Is the pump knob the same as the blue handwheel? No. The pump knob is on the pump rod; the handwheel operates the carburetor mechanism. Does it help with missing tank pressure? No. For that, pump leather, valve, and other seals need to be checked.
Black Raptor · honestly rated
A sensible single replacement for a damaged or missing handle knob. For real pump problems, the cause is almost always deeper in the pump system.