Valve Chamber Assembly - MK3 Pumps Models 1004, 1085, 1200, 1250, 135, 140, 145, 148, 150, 152, 155, 158, 165, 168, 175, 178, 185, 188, 230, 235, 240, 243, 245, 250, 253, 255, 260, 2620, 2625, 263, 2640, 265, 270, 275, 283, 285, 290, 295, 298, 340, 342, 35, 350, 352, 355, 360, 362, 365, 372, 375, 382, 383, 390, 390T, 393, 396, 398, 399, 4215, 4220, 4225, 4235, 4240, 4245, 4255, 4260, 4265, 4270, 4315, 4320, 4325, 4335, 4345, 4355, 4360, 4365, 4370, 50E, 550, 565, 575, 5860, 590, 670, 675, 690, 698, 698T, 699, 180, 20E, 20F, 30E, 40, 415, 435, 440, 475, 481, 492, 425 Xtra, 435 Xtra, 455 Xtra, 460 Xtra, 470 Xtra, 480 Xtra, 425, 460, 465, 445 Xtra