8mm - 4mm (2) Hose OD Y Connector Reducer Push Fit Hose Joiner
uxcell Straight Brass Barb Fitting Reducer, Fit Hose ID 8mm to 4mm 3pcs
4mm x 8mm Push-in Fitting with Plug-in PA EPDM/PTFE | Tameson.co.uk
Push in 4mm 6mm 8mm 10mm 12mm 14mm 16mm PC Pneumatic T Fitting Push Fit PE Fitting Tee Hose Connector Plastic for Pneumatic - China Pneumatic Fitting, Quick Coupling | Made-in-China.com
4mm Hose OD G 1/8" BSPP Straight Male Push Fit Hose Fitting
8mm>4mm>8mm T Piece Reducer Barbed Plastic Hose Connector