16.6MM04=R1/2≈20.9MM06=R3/4≈26.4MM?Main feature :1) There are wide varieties of brass push in brass fittings meeting all kinds of requirements in hose related system.2) Rotary body to make pipe connection available at 360 degree after installed.3) Nickel-plated body make the fitting resist to more corrosive and polluted condition.4) All taped thread fittings are coated with sealant.5) All parallel thread fittings are fitted with O ring.FAQQ1. Are you manufacturer or trading company? A1. We ar