Redline Airsoft Female/Female Self Sealing Coupler Redline Airsoft $19.90 Default - $19.90 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! Male/Female Self Sealing Coupler, this is the same coupler that comes on our air systems. 1/8 NPT Male threads. 200 PSI working pressure.