https://www.amazon.com/Mingle-Pressure-Adapter-Connect-Lavorwash/dp/B07GXJMR2L#customerReviews

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This particular model doesn't look like it matches, but one of the product photos shows 8 different adapter variants. I think #6 might be compatible; the description says "#6 fits... pacific hydrostar". Their customer service can probably answer that question.

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I think this one on eBay might be the same product.

https://www.ebay.com/itm/383771014864?hash=item595a88f6d0:g:6gEAAOSwU55fr5Y2

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And the Stihl/Kew/Alto/Nilfisk nozzle here:

https://www.ebay.com/itm/123606898892?hash=item1cc78b98cc:g:n10AAOSw0QlgSOOa

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Complete foam cannon here that looks right, option A2.

https://www.ebay.com/itm/193564348204?_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20201210111314%26meid%3D93f49352d5f047e18eeda8ebc67bc93c%26pid%3D101195%26rk%3D1%26rkt%3D12%26mehot%3Dpf%26sd%3D123606898892%26itm%3D193564348204%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv9PairwiseUnbiasedWeb%26brand%3DMJJC&_trksid=p2047675.c101195.m1851