Boardwalk® Siphon Pump contains a convenient, easy storage plunger that locks down to reduce its height for compact storage. The easy-to-use, siphon pump is great for a variety of applications where it’s more convenient to use a hand pump than remove a cap and squeeze out. The reliable pump can be used with soaps, lotions, and chemical concentrates. The versatile pump fits multiple adaptors; including 38/400, 89/400, 110/400, 120/400. Type: Siphon; Style: Push Pump; Operating Principle: Displacement; Volume @ Number of Strokes: 1 oz @ 1.