HPA Fill Nipple Cover OP43 $1.50 was $2.50 Default Title - $1.50 Quantity This product is currently out of stock. We may not keep this item in stock. Please fill in the form below and we will let you know availability! RUBBER HPA FILL NIPPLE COVER - BLACK Rubber cover that fits over the fill nipple on your HPA tank.Keeps the mud, dirt and water out. Protect your nipples!