Blue Diamond 4mm Air Line Check Valve SKU: BD-V01300 (0) No Reviews yet $6.99 Quantity discounts available QuantityPrice In Stock Quantity -+ Add to Cart Product Overview Blue Diamond 4mm Air Line Check Valve 3/16" outlet fits silicon air tubing. Product OverviewBackProduct OverviewBlue Diamond 4mm Air Line Check Valve3/16" outlet fits silicon air tubing.See MoreSee Less Reviews 0 BackRatings & ReviewsNo reviews availableBe the first to Write a Review