These service kits include the diaphram and valves required to service the Henderson Chimp Mk2 pump. Neoprene service kits are suited to exposed installations but are less tolerant to oils and chemicals. Nitrile service kits are oil and chemical tolerant but have a reduced service life in high UV exposure. The neoprene kit is Whale assembly (AK8015). The nitrile kit is Whale assembly (AK8017). Click download PDF for a complete exploded diagram.