4pcs Nuonuowell Plastic Inner Diameter 12mm 16mm 20mm 25mm Pe Tee Connector Four Five Way Joint Pipe Adapter Wardrobe Fittings - Garden Water Connectors - AliExpress
5pcs 1.6mm-6.4mm Plastic Male Luer Joint Plastic Hose Joints Plastic Thread Joint Male And Female Adapter Medical Hose Connector - Pipe Fittings - AliExpress
Orbit 1/2 in. PVC Hose Adapter 10118H - The Home Depot