Cheap And Discounts Brass Fitting F/M M10 M12 M14 M16 M18 M20 M22 Female to Male Thread Brass Pipe Connectors Copper Coupler Adapter Threaded joint Wholesale. Buy Directly From Merchant TonKing. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.