WHALE Service Kit for Whale V Pumps MK5 and MK6 including the most common serviceable parts. Use this service kit when your V-Pump started to leak, is slow to prime or the pump failed to work. Whale V Pump Mk5 and Mk6 Service Kit Includes: 1 x Mk5 Handle Buffer. 1 x Mk6 Buffer. 1 x Cup packing. 1 x Valve. 1 x Valve Stem. 1 x Plunger Cup Seat. 1 x U Gland Packing. and O Rings.