Upgrade your 65 watt MKII pump with a 304 stainless steel replacement head. Stainless steel provides more durability, and is much easier to work with if you're attaching ball valves or other stainless fittings to the pump head. The standard polysulfone head that comes on the MKII can be prone to breaking if too much force is applied while opening and closing an attached ball valve. Upgrade to the stainless for added durability and dramatically increased reliability.

Stainless Steel Pump Head For 65 Watt MKII Pump