Stens Primer Bulb replaces Briggs & Stratton OEM# 4128, 4178, 494408, 5084D, 5084H, 5084K, 691347, 694394. Includes Retainer, without hole, 3/4" Height x 3/4" O.D. Fits Models: 10A902, 10A982, 98902 and 98982 with Pulsa-Prime Carburetors; and Quantum Series with 3.5, 3.75 & 4.0 HP. Stens# 120-018, 120-178.