Get secure, high-flow lubrication with our Grease Nipple Internal Thread Button Head Grease Coupler. This durable coupler features a circumferential thread (or button-style) slip joint for easy, hands-free attachment. Constructed from corrosion-resistant materials, it's designed for heavy-duty applications requiring ample grease volume. Common thread sizes include M10 x 1 and G1/8 BSP. Diameter typically 16mm.