Dura Plastics 3/8-in Schedule 40 PVC Coupling in the PVC Pipe & Fittings department at Lowes.com
Amazon.com: PureSec 3/8 inch Tee Connector Push to Connect Fittings Plastic Quick Fitting for water purification&RO System (5, 3/8" Tube O.D.X3/8" Tube O.D.X 3/8" Tube O.D.) : Industrial & Scientific
Amazon.com: 20 pcs 3/8" Barb x 3/8" NPT Male Connector, Plastic Hose Barb Fitting, Adapter, Industrial Hose Barb to Pipe Fittings Connect : Industrial & Scientific
1/4" 3/8" OD Hose Tube 1/4" 1/2" 3/4" 1/8" Plastic Pipe Quick Connectors RO Water Elbow Fittings Water Purifier Pipe Fitting - AliExpress
Amazon.com: Quickun 3/8" Hose Barb 90 Degree Elbow L Fitting, Plastic 2 Way Equal Barbed Joint Splicer Mender Union Adapter Hose Fitting ( Pack of 5 ) : Industrial & Scientific
3/8″ x 1/4″ x 3/8″ Reducing Run Tee – Desert Water Conditioning
Source High Quality 3/8*3/8 Press Elbow High Pressure Compression Water Hose Male Quick Connect Fittings Plastic Pipe Connector on m.alibaba.com
Watts 1/2 in. x 3/8 in. Plastic O.D. x MPT Connector PL-3035 - The Home Depot
3/8" 3 Way UPVC Tee Pipe Fittings, Joint Coupling Pipe Adapter, 3pcs Dark Gray | eBay
Amazon.com: PureSec 3/8 Water Line Fittings 3/8 Push to Connect Fittings for 3/8 OD Tubing(3/8 Ball Valve+3/8 T fitting+Y+L+I, Pack of 10) : Industrial & Scientific
Everbilt 1/2 in. Barb x 3/8 in. MIP Nylon Adapter Fitting 800219 - The Home Depot
BANJO TEE038 3/8" FPT POLY PIPE TEE
3/8" Gray PVC Schedule 40 Pipe | U.S. Plastic Corp.
Amazon.com: JoyTube Plastic Hose Barb Fittings 3/8" Barb X 1/2" NPT Male Thread Adapter Connector Pipe Fittings (pack of 6) : Industrial & Scientific
Amazon.com: 20 pcs 3/8" Barb x 3/8" NPT Male Connector, Plastic Hose Barb Fitting, Adapter, Industrial Hose Barb to Pipe Fittings Connect : Industrial & Scientific
3/8 DD-SS - Pipe Fittings and Port Adapters | Hydradyne LLC
Reverse Osmosis Quick Coupling, Elbow Water Filter Plastic Pipe Fittings, Water Dispenser Coffee Maker - Temu