Flow-by: zero at 8 psi (0,6) bars) or greater Factory installed check valve: 9.5 'ft. of hd. at 18psi (2.9m/hd at 1.2 bars) minimum for pop-up Side outlet installation with LX6 and LX12 models is not recommended in freezing climates Options LX-CV Factory installed check valve LX - NP Field installable (snap on) non-potable cover Model Specifications LX3 - 3" (7,6cm) pop-up body LX4 - 4" (10cm) pop-up body LX6 - 6" (15cm) pop-up body LX12 -12"(30cm) pop-up body LXS -1/2 threaded shrub adapter