Exhaust Systems & Environmental Protection With in-house design and manufacture of individual components through to complete exhaust systems, Halyard offers the most advanced products available with a range of standard and bespoke solutions designed and optimised to suit your needs. We specialise in both wet and dry exhaust systems and as a distributor for Emigreen aftertreatment solutions can also provide DPF and SCR packages to meet the latest emissions requirements. In addition, we are distributors for Wave International filtration products and the Aquadrive antivibration drive system.