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Hi all. I have a vailant ecotec 831 r1 boiler, the pump is starting to get a bit noisy, I have a gas safe friend that will fit a replacement for me, I know I need a 178983 pump for my type of boiler, but I have noticed the words ( Type VPal - 7/2a ) on some pumps & ( Type VPal - 5/2a) on other...