Forestry Hose Couplings - 38mm (1.5") Quick-Connect
485030205 (PFP-20HPHND-2D) 4" inlet
https://www.wfrfire.com/shop/forestry-hose-couplings-38mm-1-5-quick-connect-5755
https://www.wfrfire.com/web/image/product.template/5755/image_1920?unique=87815ef