Check the listing for details. HK Army Fill Nipple Cover Cap Protector for Paintball Tank Regulator - Green. Condition: New. Listed at 12.49 USD. HK Army Fill Nipple Cover - Green Keep your air tanks fill nipple protected with the HK Army fill nipple cover. The cover can easily be snapped on and off with its ball bearing locking technology. The fill nipple cover ensures that no dirt or paintball debris clogs up the nipple and helps prevent air leaks or regulator / air tank internal damage.Fill Nipple Cover Details:Machined aluminum cover Fits all one way valves / fill nipples on air system regulatorsEasily pushed on and off fill nipple Being sold by reputable paintball dealer (PB Sports) Payment may be made by PayPal, MasterCard, Visa, Discover, or American Express. If you want to pay with credit card outside of Paypal, select credit card at checkout, then call us to arrange payment. FREE Standard Shipping! Upgrade to USPS Priority Mail for only $3.00 more! $9.95 for UPS Ground in 48 states. We Do Not Ship Outside the United States, sorry.