8.709-539.0 Coupler Twist Plug 1/4 Mpt ships factory direct right to your door. ADDITIONAL PRODUCT NOTES: 1/4'' MPT Twist Seal Coupler Plug/Nipple, 4000 PSI 8.709-539.0 model number - 26.0080.31, material type - brass, temperature - 302 Degrees, psi - 4, 000, 331304pa, 87095390,