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It’s a connector adapter you can buy from MJJC. The purpose is to let you use a foam cannon (or cannon pro) with a Nilfisk quick-release trigger gun.
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It’s specifically designed to mate the foam cannon’s fitting to the Nilfisk quick‐release trigger gun system.
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MJJC also make versions for different “V” series foam cannons (Pro V3.0, S V3.0 etc.).
⚙ Compatible models / requirements
From MJJC’s own listing:
Compatible with:
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Stihl models: Ref. 47800124518, 47800124501, 47880124500, 47880124512, 47880124521
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Kränzle models: e.g. K1122TST, PN 98K2017, etc. Many Kränzle TS / TST series machines.
So if your washer / trigger gun is one of those, it should work well. If not, you might need to check thread sizes, pressure ratings etc.
⚠ Pros & cons / things to check
Pros:
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Allows conversion to use a foam cannon with a Nilfisk system, often increasing usefulness.
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Manufactured by a known maker (MJJC), which tends to have decent quality.
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Relatively cheap accessory, so low risk if it doesn’t work perfectly.
Cons / things to check:
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Make sure the pressure rating is OK ‒ if the connector can't handle the pressure of your pressure washer, it could leak or fail. (MJJC tends to list compatible pressure washer models, which helps.)
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Ensure fittings match: thread types / quick release types must be compatible.
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Quality of seal and durability: sometimes cheaper adapters have less robust sealing surfaces or materials.