Holley 1920, 1-barrel carburetor accelerator pump diaphragm. Flat stemmed. There are several diaphragms for the Holley 1920. The difference is in the stem, (some are flat, some are round), the length of the stem and the hole patern (which is critical to get right). The measurement shown in the picture is of the stem only, not the overall height. A gasket is not required with this acceleerator pump diaphragm.
Used on carburetors with these LIST numbers:
2136, 2303, 2416, 2417, 2418, 2419, 2500, 2533, 2534, 2535, 2536, 2537, 2765, 2766, 2767, 2768, 2769, 2770, 2885, 2886, 2887, 2888, 2889, 2890, 2918, 2997, 2998, 2999, 3053, 3054, 3057, 3058, 3059, 3060, 3152, 3225, 3226, 3227, 3228, 3229, 3271, 3272, 3273, 3274, 3275, 3276, 3277, 3278, 3279, 3280, 3281, 3282, 3397, 3398, 3399, 3446, 3671, 3672, 3673, 3674, 3919, 3920, 3921, 3922, 3924, 3982, 3983, 3984, 3985, 4012, 4013, 4351, 4352, 4353, 4354, 4355, 4356, 4357, 4358, 4359, 4361, 4362, 4363, 4414, 4416, 4641, 4642, 4655, 4656, 4657, 4658, 4659, 4712, 4750, 4751, 4755, 4756, 6159, 6202, 6260, 6482, 6483, 6876, 7249, 7250, 7583, 7584, 7587, 7747, 8213, 8311, 8388, 8400, 8401, 8404
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