Duotight Push-In Fitting – 9.5mm(3/8in) Joiner/Coupler The Malt Shop Sale! from 50000 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Both sides are push-in side and compatible with 9.5 mm outer diameter (OD) tubing. SKU:KEG904 8mm coupler duotight equipment fitting joiner Kegging push-in