£26.94 inc VAT Sievert 8716 Neck and Valve Assembly for direct connection onto the Primus 2000 cylinder giving precise flame control. Back pressure valve to reduce the risk of a flare-up. It will accept burners of M8 x 0.75 thread from the Sievert Burner range 8725, 8719, 8720, 8842. Add to Basket Quantity