Home / Agriculture / Straight Coupler Straight Coupler Socket for connecting LDPE Tubing Pipes. Size Choose an option16mm20mm16mm20mmClear Contact via WhatsApp Related products Soil Plug 47mm Garden Tray – 40 holes Micro Tubing Hole Puncher 4mm for LDPE Tubing 4″ X 2″ Rectangular Pipe End Cap PE Mulch Film / Black Over Silver